consider a state in a metal conduction band that is 0.13 above the fermi energy. the metal is at a temperature of 1000k. what is the probability to find an electron on this state?
Answers
The probability of finding an electron in the given state is approximately 0.28 or 28%.
f(E) = 1 / [exp((E - EF) / kT) + 1]
where EF is the Fermi energy, k is Boltzmann's constant, and T is the temperature.
Substituting the given values, we have:
EF + 0.13 eV = 0.13 * 1.602 × \(10^{-19}\) J = 2.0866 × \(10^{-20}\) J
T = 1000 K = 8.617 × \(10^{-5}\) eV/K * 1000 K = 0.08617 eV
Plugging in these values, we get:
f(E) = 1 / [exp((2.0866 × \(10^{-20}\) J - EF) / (1.38 × \(10^{-23}\) J/K * 1000 K)) + 1]
f(E) = 1 / [exp((2.0866 × \(10^{-20}\) J - EF) / 1.38 × \(10^{-20}\) J) + 1]
f(E) = 1 / [exp((2.0866 × \(10^{-20}\) J - EF) / 1.38 ×\(10^{-20}\) J) + 1]
f(E) = 1 / [exp(0.13 / 1.06) + 1] ≈ 0.28
Fermi energy, also known as Fermi level, is a concept in solid-state physics that refers to the energy level at which a system of fermions, such as electrons, is at equilibrium at absolute zero temperature. At this temperature, all the available energy states in a material are occupied by electrons up to the Fermi energy level. The energy of these electrons is referred to as the Fermi energy.
The Fermi energy plays a significant role in determining the electrical and thermal properties of materials, as it is related to the density of states of electrons within a solid. The Fermi energy is also used to describe the behavior of electrons in semiconductors and metals, as it helps to determine whether a material is a conductor, an insulator, or a semiconductor.
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Related Questions
A unfortunate small car crashes against a large moving truck. Compared to the force of the small car on the large truck, what is the force of the large truck on the small car
The force of the small car on the large truck is larger then the face of the large truck on the small car.
The forces are the same
The force of the small car on the large truck is smaller then the face of the large truck on the small car
The forces can not be measured.
A. the force of the small car on the large truck is larger then the force of the large truck on the small car.
B. the forces are the same.
C. the force of the small car on the large truck is smaller than the force of the large truck on the small car
D. The forces cannot be measured
Answers
The correct statement, given the data from the question is:
The forces are the same (Option B)
Newton's third law of motionNewton's third law of motion states that to every action, there is an equal an opposite reaction.
From the law given above, we can say that if a 50 N is applied to hit an object, the object is also returning a 50 N on the hitter.
Considering the question given above, we can thus conclude, haven understood Newton's third law of motion, that the force of the large truck on the small car is the same.
Thus, the correct answer to the question is Option B: The forces are the same.
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The satellite space explorer flies 180600 miles in 21 hours. Find the rate of change.
Answers
The rate of change, or speed, of the satellite space explorer, is approximately 8600 miles per hour.
Given:
Distance = 180600 miles
Time = 21 hours
The rate of change represents the speed or velocity at which the satellite is traveling.
Rate of change (Speed) = Distance ÷ Time
Rate of change (Speed) = 180600 ÷ 21
Rate of change (Speed) = 8600 miles /hour
So, the rate of change, or speed, of the satellite space explorer is approximately 8600 miles per hour.
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How does energy from an earthquake reach each surface? Describe the three types of seismic waves.
Answers
https://en.m.wikipedia.org › wiki
5.31 Land rover ads used to claim that their vehicles could climb a slope of 45 Degrees. For this to be possible, what is the minimum coefficient of static friction between the vehicle's tires and the roads?A .5B .7C .9D 1.0
Answers
Land rover ads used to claim that their vehicles could climb a slope of 45 Degrees.
Hence, the correct option is D.
We can use the following formula to calculate the minimum coefficient of static friction required for the Land Rover to climb a slope of 45 degrees.
tan θ = coefficient of static friction
Where θ is the angle of the slope.
For a slope of 45 degrees, we have
tan 45 = coefficient of static friction
By simplifying, we get
1 = coefficient of static friction
Hence, the minimum coefficient of static friction required for the Land Rover to climb a slope of 45 degrees is 1.0.
Hence, the correct option is D.
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An eccentric inventor attempts to levitate by first placing a large negative charge on himself and then putting a large positive charge on the ceiling of his workshop. Instead, while attempting to place a large negative charge on himself, his clothes fly off. Explain.
Answers
Answer:
shirt is little attached to the body, it can come off and fly away
Explanation:
In electrostatics, charges of different signs attract and charges of the same sign repel.
In this case, when a negative charge is placed on it, both the inventor and the shirt are charged, therefore there is a repulsive force, also there is an attraction between the positive charge of the roof attracts the negative charge, such as the shirt. of weak the two forces not greater than the resistance of the walk.
As the shirt is little attached to the body, it can come off and fly away
a) A standing wave of frequency 7.33 Hz is set
up on a string 1.5 m long with nodes at both
ends and in the center, as shown.
1.5 m
Find the speed at which waves propagate
on the string.
Answer in units of m/s.
b) Find the fundamental frequency of vibration
of the string.
Answer in units of Hz.
Answers
The find the speed at which waves propagate on the string, we can use the formula v = fλ Where v is the velocity, f is the frequency, and λ is the wavelength. the fundamental frequency of vibration of the string is 3.67 Hz.
The case, we know the frequency is 7.33 Hz, and we can find the wavelength by considering the length of the string and the nodes. The distance between nodes is half a wavelength, so the distance between the nodes at each end is 0.75 m. Therefore, the wavelength is twice this distance, or 1.5 m. v = 7.33 Hz x 1.5 m = 11.0 m/s Therefore, the speed at which waves propagate on the string is 11.0 m/s. b) To find the fundamental frequency of vibration of the string, we can use the formula f1 = v/2L Where f1 is the fundamental frequency, v is the velocity (which we just found to be 11.0 m/s), and L is the length of the string (which is 1.5 m). f1 = 11.0 m/s / (2 x 1.5 m) = 3.67 Hz Therefore, the fundamental frequency of vibration of the string is 3.67 Hz.
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After overcome that from of friction you must push against.... friction
Answers
Answer:
In static friction, the frictional force resists force that is applied to an object, and the object remains at rest until the force of static friction is overcome. In kinetic friction, the frictional force resists the motion of an object. For the case of a brick…
What must happen for salt and water to form a solution?
O A. The salt and the water must combine to form a new substance.
B. The salt and the water must combine chemically.
C. The water must displace the salt.
O D. The salt must dissolve in the water.
Answers
An object has a mass of 25 grams and has a length of 5 cm, a width of 1 cm, and a height of 5 cm, what is it's density
Answers
An object has a mass of 25 grams and has a length of 5 cm, a width of 1 cm, and a height of 5 cm, then its density is 1000 kg/m³.
Density is the ratio of mass to volume. it tells how much mass a body is having for its unit volume. for example egg yolk has 1027kg/m³ of density, means if we collect numbers of egg yolk and keep it in a container having volume 1 m³ then total amount of mass it is having will be 1027kg. Density is a scalar quantity.
In this problem,
Given,
mass m = 25 g = 0.025 kg
length l = 5 cm = 0.05 m
width w = 1 cm = 0.01 m
height h = 5 cm = 0.05 m
The volume of the object = hlw = 0.05×0.05×0.01 = 25 × 10⁻⁶ m³
Density = mass/ volume = 0.025 kg / 25 × 10⁻⁶ m³
Density = mass/ volume = 1000 kg/m³
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In recent years it has been possible to buy a 1. 0 F capacitor. This is an enormously large amount of capacitance. Suppose you want to build a 1. 1 Hz oscillator with a 1. 0 F capacitor. You have a spool of 0. 25-mm-diameter wire and a 4. 0-cm-diameter plastic cylinder.
How long must your inductor be if you wrap it with 2 layers of closely spaced turns?
Answers
An oscillator is an electronic device that produces an electrical signal at a specific frequency. A capacitor is an electrical component that stores electrical energy. In recent years, it has become possible to purchase a 1.0 F capacitor. This is an incredibly large amount of capacitance.
Suppose you want to build a 1.1 Hz oscillator using a 1.0 F capacitor and a spool of 0.25-mm-diameter wire and a 4.0-cm-diameter plastic cylinder. We can calculate the required inductance value using the formula:f = 1/2π√(L*C)Where f is the desired frequency, L is the inductance value, and C is the capacitance value. Substituting the given values:
\(f = 1.1 HzC = 1.0 F\)
Plugging these values into the formula and solving for L:
1.1 Hz = 1/2π√(L*1.0 F)2π*1.1 Hz = √(L*1.0 F)6.88 Hz2 = L*1.0 F6.88 H/ F = LL = 6.88 H
\(1.1 Hz = 1/2π√(L*1.0 F)2π*1.1 Hz = √(L*1.0 F)6.88 Hz2 = L*1.0 F6.88 H/ F = LL = 6.88 H\)We need to wrap this inductance value with two layers of closely spaced turns around the plastic cylinder.
The inner diameter of the cylinder is equal to the diameter of the wire, which is 0.25 mm or 0.00025 m. Therefore:d = 0.00025 mThe outer diameter of the cylinder is 4.0 cm or 0.04 m. Therefore:D = 0.04 mPlugging these values into the formula for A:
\(A = (π/4)(0.04² - 0.00025²)A = 0.001257 m²\)
Plugging these values into the formula for L:
\(L = µn²A/lSolving for l:l = µn²A/L\)
Plugging in the given values:
\(µ = 4π x 10^-7 H/mn = 2\)
(since we want two layers)
\(A = 0.001257 m²L = 6.88 Hl = (4π x 10^-7 H/m)(2²)(0.001257 m²)/(6.88 H)l ≈ 0.0015 m\) or 1.5 mm
Therefore, the length of the inductor should be approximately 1.5 mm.
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a small circular hole 6.00 mmmm in diameter is cut in the side of a large water tank. the top of the tank is open to the air. the water is escaping from the hole at a speed of 15 m/sm/s . part a how far below the water surface is the hole?
Answers
The hole is 5.10 m underneath the water's surface.
What's really air and what does it do?On earth, air is indeed a natural attribute that supports life. It occurs in the atmospheric and is essentially a mixture of many different gases, with oxygen, nitrogen, and carbon dioxide making up the majority of it and argon, water vapor, and other gases making up considerably less of it. Aerosolized dust, spores, and germs are also present in the air.
What function does air serve?To breathe, we all require oxygen. All living things, both those that are aquatic and those that are on land, require oxygen to survive. Without the basic component of air, life would not be possible.
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can someone please help me
Answers
2. Speed
3. Kinetic energy
what is a amplitude????????
Answers
Using the law of conservation of energy, what is the kinetic energy at B? K.E. = 3, 6, or 4.8
Answers
Answer:
3
Explanation:
If the number of turns in a solenoid is cut in half, what will the current need to be to maintain the same magnetic field in the solenoid?
a. Twice
b. same
c. half
d. one fourth
Answers
To maintain the same magnetic field in a solenoid when the number of turns is cut in half, the current will need to be:
a. Twice
The magnetic field (B) inside a solenoid is given by the formula B = μ₀ × n × I, where μ₀ is the permeability of free space, n is the number of turns per unit length, and I is the current flowing through the solenoid.
When the number of turns is halved, n becomes n/2. To maintain the same magnetic field (B), we need to find the new current I':
B = μ₀ × (n/2) ×I'
Since we want to maintain the same magnetic field, we have:
μ₀ × n × I = μ₀ × (n/2) × I'
Dividing both sides by μ₀ and n, we get:
I = (1/2) × I'
Therefore, to maintain the same magnetic field, the new current I' must be twice the original current:
I' = 2 ×I
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Galileo is often credited
Answers
Answer:
....with the early discovery of four of Jupiter's many moons.
Explanation:
Galileo is often credited with the early discovery of four of Jupiter's many moons. The moons orbiting Jupiter follow the same laws of motion as the planets orbiting the sun. One of the moons is called Io - its distance from Jupiter's center is 4.2 units and it orbits Jupiter in 1.8 Earth-days.
¿Cuál de la plantas generadoras de electricidad te parece que tiene mas respeto por el medio ambiente?
Answers
Which state of matter does this model represent?
Solid
Liquid
Gas
Plasma
Answers
Answer:
Gas, because in gas state all the molecules are floating and are far apart from each other.
Hope that helps...
45 V =
2.0 Ω
www
6.0 Ω
3.0 Ω
>4.0 Ω
What is the equivalent resistance in this circuit?
Ω
What is the current in this circuit?
A
Answers
Answer:
Current = 22.5A
Explanation:
By using ohm's law \(i = \frac{v}{q} \)45/2 = 22.5Please I need at least 3 differences between high and low specific heat capacity I will mark you brainliest
Answers
===========================================================
| Specific Heat Capacity |"What Is It and What Are Some Differences Between High and Low Specific Heat Capacity?"
===========================================================
Hello! Today, let's begin with discussing what specific heat capacity is.
"What is Specific Heat Capacity?"
It is the amount of heat per unit required to increase the temperature by 1°C. Most of the time, specific heat is used for determining the processing temperatures as well as amount of heat that is necessary for processing. It is helpful in differentiating between that of two polymeric composites.XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
"What is High and Low Specific Heat Capacity?"
Now, this specific situation is asking a question regarding the differences between high and low specific heat capacity. When the specific heat capacity is high, this means that it takes more energy to either increase or decrease its temperature. Take water for instance; water has a high specific heat, meaning it will take more energy to increase the temperature of the liquid compared to other substances. That's why when you are boiling water in a pot, the water needs time to absorb heat before it begins to boil at the increase in temperature.On the other hand, when the specific heat capacity is low, this means that it doesn't take as much energy to increase or lower as high SHC does. For example, any metals such as iron have low specific heat. It doesn't take long for the substance's energy to increase the temperature. The same thing occurs when you place a spoon in a cup of hot coffee. It is said that even other substances like sand have relatively low specific heat.______________________________________________________
Hopefully this sort of helps you have a better understanding of what specific heat is, as well as the differences between that of high and low specific heat capacity. Also, if this is a write your answer response, it is better to dive further into your studies and notes regarding this topic so you can properly answer the question and follow the guidelines. Anyways, I wish you the best of luck on your assignment. Thanks for reading!
A 5.3 kg bowling ball begins rolling down a lane at the bowling alley at 6.6 m/s. When it strikes the pins, it is estimated to be moving at 4.0 m/s. What is the magnitude of energy that is lost due to friction?
Answers
The magnitude of energy that is lost due to friction is 73.7Joules.
What is energy ?In order to accomplish work and to produce heat and light, energy must be transferred to a body or to a physical system. Energy is the quantitative attribute that does this. Energy is a preserved resource; according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed.
Computers, vehicles, communications, state-of-the-art medical technology, and many other things are all powered by energy. The demand for dependable and economical energy is especially pressing for emerging countries. It can be beneficial and even life-saving.
Energy required by the body is the kinetic energy
Kinetic Energy = 1 / 2 mv²
m = mass
v = velocity
For the 5.3kg moving at 6.6m/s
kE = 1/2 * 5.3 * 6.6²
KE = 1/2 * 5.3 * 43.56
KE = 115.71Joules
for the 5.3kg moving at 4m/s
KE = 42 joules
Amount of energy lost
= 115.71Joules - 42 joules
= 73.7 joule
Thus, the amount of Energy lost is73.7Joules.
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16 points and brainiest whoever is right
Two identical springs are dangling from the ceiling. The first spring is pushed upward with a
force of magnitude 188 N, compressing the spring by 21.8 cm. A box of weight 38 N is
attached to the end of the second spring. What distance is the second spring stretched?
Answers
188=k*21.8
k=188/21.8=8.62,
In the second part you use
m g= k x
x=m g/k= 38/8.62=4.4cm
4.4 cm is the answer
Miles and Allison are conducting a science experiment on bacteria and
they have a different hypothesis about what is going to happen. After
repeating their experiment several times, they realize that the results of
the experiment do not clearly support either hypothesis. What should
Miles and Allison do next?
O A. assume Miles hypothesis is correct
O B. revise their hypotheses and do another test
C. change their results to match one of their hypotheses
O D. repeat the experiment until it supports one of their hypotheses
Answers
what is the approximate boiling pressure of refrigerant oil in a system?
Answers
Refrigerant oil boiling pressure The boiling pressure of refrigerant oil is determined by the temperature of the system. This temperature varies depending on the pressure exerted on the oil. The refrigerant oil will boil at a different temperature for each refrigerant.
The boiling point of refrigerant oil can be estimated by determining the boiling pressure at a certain temperature of the system. The approximate boiling pressure of refrigerant oil in a system ranges from 20 to 30 psig. However, this value may vary depending on the type of refrigerant used in the system. The refrigerant oil can also be changed depending on the type of refrigerant used in the system.The type of refrigerant used in the system will also affect the boiling pressure of refrigerant oil. A refrigerant is a substance that changes from a liquid state to a gaseous state at a specific temperature. It is used in refrigeration systems to transfer heat from one location to another. The refrigerant oil is added to the system to ensure that all parts of the system are lubricated. This prevents the parts from grinding together and causing damage.
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The ratio of force and mass is known as
A. Velocity B. Momentum C. Acceleration D. Displacement
Answers
Answer:
Acceleration
Explanation:
We know that Force = Mass * Acceleration according to the formula.
Divide both sides by “Mass” which leaves us with Force/Mass = Acceleration, in word, it’s ratio of force and mass equals acceleration.
How does Physics connect to the Greenhouse Effect?
Answers
Answer: The greenhouse effect is caused by certain gases in the Earth's atmosphere trapping heat from the sun, which leads to climate change. Physics plays a role in understanding this phenomenon and developing solutions to mitigate its effects.
Explanation:
Part (A) A light, rigid rod of length
ℓ = 1. 00 m
joins two particles, with masses
m1 = 4. 00 kg
m2 = 3. 00 kg
at its ends. The combination rotates in the xy-plane about a pivot through the center of the rod. Determine the angular momentum of the system about the origin when the speed of each particle is 6. 40 m/s.
I got the answer to be 22. 4 with a +z direction.
Part (B) What would be the new angular momentum of the system (in kg · m2/s) if each of the masses were instead a solid sphere 10. 5 cm in diameter?
I'm not sure how this changes the equation. All my attempts are incorrect so far
Answers
In Part A, the angular momentum of the system about the origin can be calculated using the formula:
L = r × p, where r is the position vector from the origin to the center of mass of the system, and p is the linear momentum of the system. In this case, since the system is rotating in the xy-plane about the origin, the angular momentum is in the +z direction. The position vector r is perpendicular to the plane of rotation and has a magnitude of ℓ/2. The linear momentum of each particle is mvi, where vi is the speed of the particle. Using this information, we can calculate the angular momentum of the system as: L = (ℓ/2) × (m1v1 - m2v2). Substituting the given values, we get: L = (1/2) × (4.00 kg × 6.40 m/s - 3.00 kg × 6.40 m/s) = 22.4 kg·m^2/s. In Part B, we need to find the new angular momentum of the system if each of the masses were instead a solid sphere 10.5 cm in diameter. In this case, we can assume that the spheres rotate about their own center of mass. The moment of inertia of each sphere can be calculated using the formula for the moment of inertia of a solid sphere: I = (2/5) × mr^2, where m is the mass of the sphere and r is the radius of the sphere. Substituting the given values, we get: I = (2/5) × (m/4π) × (10.5/200)^2, where m = 4.00 kg for one sphere and m = 3.00 kg for the other sphere. The total moment of inertia of the system can be found by adding the moments of inertia of the two spheres. We can then use the formula for the angular momentum of a rotating object: L = Iω, where ω is the angular velocity of the system. However, we do not have enough information to find the angular velocity ω. Therefore, we cannot find the new angular momentum of the system with the given information.
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Find the force on an object which has a mass of 20 kg and an acceleration of 10 m/s2.
Answers
Answer:
200N
Explanation:
mass = 20 kg
acceleration = 10 m/s^2
Force = mass * acceleration
= 20 *10
= 200 N
One cell performs 120 oscillations per minute, the other 240. What will be the ratio of their lengths ( I translated it sorry for mistakes)
Answers
Answer:
360²
Explanation:
hoped this helped (ejfigueroa5 had the answer thank you to ejfigueroa5)
A 3,220 lb car enters an S-curve at A with a speed of 60 mi/hr with brakes applied to reduce the speed to 45 mi/hr at a uniform rate in a distance of 300 ft measured along the curve from A to B. The radius of curvature of the path of the car at B is 600 ft. Calculate magnitude of the total friction force exerted by the road on the tires at B. The road lies in a horizontal plane. 1 mile
Answers
The magnitude of the total friction force exerted by the road on the tires at B will be 919.46 lb.
What is the friction force?It is a type of opposition force acting on the surface of the body that tries to oppose the motion of the body. Its unit is Newton (N).
Mathematically, it is defined as the product of the coefficient of friction and normal reaction.
The given data in the problem is;
The weight is,W= 3,220 lb
The speed is,u= 60 mi/hr
The reducing speed is,v= 45 mi/hr
The distance traveled is,d= 300 ft
The radius of curvature of the path of the car at B is,R= 600 ft.
1 mile = 5280 ft
From the Newtons' equation of motion;
\(\rm v^2 = u^2 +2ad \\\\ \rm (45 \times \frac{5280}{3600} )^2 = (60 \times \frac{5280}{3600} )^2 +2a\times 300 \\\\\)
The tangential accelerations are;
\(\rm a_t = \frac{66^2 -88^2}{600} \\\\ \rm a_t = -5.65 ft/sec^2 \\\\\)
The force is found as;
\(\rm \sum F = ma \\\\ \frac{3220}{32.2} \times -5.65 \\\\ F_T= 565 \ lb\)
The normal force is;
\(\rm F_n = \frac{3220}{32.2} \times \frac{66^2}{600} \\\\ F_N =726 \ lb\)
The net or the total friction force exerted by the road on the tires at B. is found as;
\(\rm F = \sqrt{(565)^2+(726)^2} \\\ F = 919.946 \ lb\)
Hence, the magnitude of the total friction force exerted by the road on the tires at B will be 919.46 lb.
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