how does the frequency of a particular spectral line of the sun compare with the frequency of that line observed from a source on earth?

\(\\ \sf\longmapsto 300-70.5=229.5kJ\)

We know

\(\boxed{\sf Efficiency=\dfrac{Used\:Energy}{Supplied\:Energy}\times 100}\)

\(\\ \sf\longmapsto Efficiency=\dfrac{229.5}{300}\times 100\)

\(\\ \sf\longmapsto Efficiency=\dfrac{229.5}{3}\)

\(\\ \sf\longmapsto Efficiency=76.5\%\)

Answer:

According to the wave theory of light, the energy of radiation depends only on the intensity or wave amplitude (brightness), not the frequency (what type of light; e.g red light or green light; visible light or gamma) According to the particle theory of light states the energy of radiation depend only on the frequency ...

Explanation:

The wavelength of the 1.0-MeV gamma-ray photon is much smaller than the wavelength of the neutron having the same kinetic energy at 1.99 x 10⁻¹⁹ m and 1.79 x 10⁻¹⁵ m respectively.

The de Broglie wavelength λ of a particle can be given by the expression:

λ = h/p

where h = Planck's constant and p = momentum of the particle.

For a photon, the momentum can be given by:

p = E/c

where E = energy of the photon and c = speed of light.

For a gamma-ray photon with energy E = 1.0 MeV = 1.0 x 10^6 eV:

p = E/c = (1.0 x 10⁶ eV) / (3.0 x 10⁸ m/s) = 3.33 x 10⁻¹⁵ kg m/s

Substituting this momentum value in the expression for λ:

λ = h/p = (6.63 x 10⁻³⁴ J s) / (3.33 x 10⁻¹⁵ kg m/s) = 1.99 x 10⁻¹⁹ m

For a neutron, the momentum can be given by:

p = √(2mK)

where m = mass of the neutron, K = kinetic energy, and c = speed of light.

Substituting the given values:

p = √(2 x 939 MeV x (1.0 MeV / 938.3 MeV)) / c

p = 3.70 x 10⁻¹⁹ kg m/s

Substituting this momentum value in the expression for λ:

λ = h/p = (6.63 x 10⁻³⁴ J s) / (3.70 x 10⁻¹⁹ kg m/s) = 1.79 x 10⁻¹⁵ m

Therefore, the wavelength of the 1.0-MeV gamma-ray photon is much smaller than the wavelength of the neutron having the same kinetic energy. The gamma-ray photon has a wavelength of approximately 1.99 x 10⁻¹⁹ m, while the neutron has a wavelength of approximately 1.79 x 10⁻¹⁵ m.

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The equation U = qV can be used to calculate the change in potential energy, where q is the proton's charge and V is the difference in voltage or electric potential.

We utilise the equation V = Ed, where E is the electric field strength and d is the distance travelled in the field, to determine V. We get V = E(5-2) = E * 3 and U = qV = q * E * 3 when the given values are substituted.Electric Potential Difference (V or V): In an electric field, the amount of energy needed to transport a charge from one place to another is known as the electric potential difference. It is frequently represented by the symbol V and has volt-based units (V).

(E) Electric Field Strength the strength of the electric field

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Answer

the answer is 6.25

Explanation:

Here, the mass of the stone (m) = 0.5 kg, velocity at which it is thrown (v) = 5 m/s, The kinetic energy of the stone (KE) =? We have, Kinetic energy of the stone (KE) = \ (\frac12mv^21) = \(\frac120.5\times5^2\) = 6.25 Joules Hence, the kinetic energy of the stone (KE) is 6.25 joules. Hope it will be helpful

Answer:

Oxygen, Argon, Carbon

edge2020

Answer:

carbon, oxygen, argon,

Explanation:

:)

If Boy A exerts a force of 3000 newtons on the box to the right and Boy B exerts a force of 5000 newtons in the opposite direction. then combined force (net force) on the box is 2000 N to the left.

Force is responsible for the motion of an object. it produces acceleration in the body. According to newton's second law force is mass times acceleration i.e. F =ma. Its SI unit is N which is equivalent to kg.m/s². There are two types of forces, balanced force and unbalanced force. When Net force is zero which is called as balanced force.

Given,

F₁ = 3000 N

F₂ = -5000 N

Net Force = F₁ + F₂

Net Force = 3000 N  - 5000 N = -2000N negative sign is for left.

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Answer: D

Explanation:

Answer:

5 seconds

Explanation:

The parts of an experimental investigation that model the weathering of rock by water would involve observing changes in the rocks due to exposure to water, while the parts that model the erosion of rock by water would involve observing how water moves rocks from one location to another.

In order to gather data to support or disprove a causal relationship, experimental investigations entail a process in which a "fair test" is designed and variables are actively manipulated, controlled, and measured. A control group is used in experimental studies that receives no treatment.

Here, the weathering of rock by water can be modeled by exposing rocks to water and observing how they change over time. For example, if you were to place rocks in a container of water and leave them for a few days or weeks, you might observe changes in the rocks due to the effects of water. These changes could include physical weathering etc.

For erosion of rock by water, this can be modeled by observing how water moves rocks from one location to another. For example, if you were to create a miniature stream by running water over a surface with rocks, you could observe how the water moves the rocks downstream and changes their location. This process can also cause physical and chemical weathering.

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Answer:

a. 86.80 m

b. i. The mass of the bob

ii. The length of the pendulum

Explanation:

a. Determine the height of the smokestack.

Using T = 2π√(L/g) where T = period of pendulum = 18.7 s, L = length of pendulum = height of smokestack and g = acceleration due to gravity = 9.8 m/s².

So, making L subject of the formula, we have

T = 2π√(L/g)

T/2π = √(L/g)

squaring both sides, we have

(T/2π)² = L/g

L = (T/2π)²g

Substituting the values of the variables into the equation, we have

L = (T/2π)²g

L = (18.7 s/2π)²(9.8 m/s²)

L = (2.976 s)²(9.8 m/s²)

L = 8.857 s² × 9.8 m/s²

L = 86.796 m

L ≅ 86.80 m

b. What factors influence the period of a simple pendulum

The factors that influence the period of a simple pendulum are

i. The mass of the bob

ii. The length of the pendulum

A current of 1.00 A flows in a wire. 1.60 × 10¹⁹ electrons flow past any point in the wire per second.

Let's calculate how many electrons are flowing past any point in the wire per second.

The amount of electric charge flowing through a conductor per unit time is known as electric current. The current flowing in a wire is a measure of the quantity of electrons passing a certain point in the circuit. When one coulomb of charge passes a point in the wire per second, the current is 1 ampere.

A coulomb of charge corresponds to 6.24 × 1018 electrons, or Avogadro's number (6.02 × 1023) of electrons. As a result, the amount of electrons flowing past any point in the wire per second can be calculated as follows:

I = Q / t

Charge = I * t

Charge = 1.00 C

Charge = 6.24 × 10¹⁸ electrons

Therefore, Number of electrons flowing past any point in the wire per second

= (1.00 C / 6.24 × 10¹⁸ electrons) x 1s

= 1.60 × 10⁻¹⁹

coulombs of charge / electron1.60 × 10⁻¹⁹ coulombs of charge / electron = 1 electron per 1.60 × 10⁻¹⁹ seconds

Therefore, 1.60 × 10¹⁹ electrons flow past any point in the wire per second.

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Answer

True; Destructive occurs for two interfering waves that are 180 degrees out of phase

When the ball reaches its maximum point, its top velocity is Its acceleration is downward and its velocity is upward.

Acceleration is the measure of how quickly a velocity varies. Usually, but not always, acceleration denotes a shift in speed. Because the origin of all its motion is altering, an object that travels in a circle while keeping its speed is also still traveling forward.

The equation a = v/t denotes acceleration (a), which is the velocity that changes (v) so over change in time (t).

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Answer:

KE = KE (incidental) - KE of emitted photons

or KE = h * f - Wf

So   h * f = KE + Wf = 1.2 + 1.88 = 3.08    incident energy

If you double the frequency then h * f = 6.16

KE = 6.16 - 1.2 = 4.96 eV

The quantization of energy levels and the restrictions on electron transitions in quantum mechanics ensure the stability of atoms. Electrons occupy specific energy levels and are confined to certain orbits around the nucleus, maintaining a balance between the attractive force of the nucleus and the centrifugal force of their motion.

In classical mechanics, atoms are described as miniature solar systems with electrons orbiting around the nucleus.

According to classical electromagnetic theory, an accelerated charged particle emits electromagnetic radiation.

Therefore, in the classical view, orbiting electrons would continuously lose energy and eventually spiral into the nucleus, causing atoms to collapse.

Quantum mechanics, on the other hand, provides a different perspective on the stability of atoms.

It introduces the concept of wave-particle duality, where particles like electrons can exhibit both particle-like and wave-like behavior.

In quantum mechanics, electrons are described by wave functions, which represent the probability distribution of finding the electron in different regions around the nucleus.

The key idea in quantum mechanics is that electrons can only occupy specific energy levels, or quantized states, within the atom. These energy levels are distinct and separated by energy gaps.

Electrons can transition between these energy levels by absorbing or emitting discrete amounts of energy, corresponding to the emission or absorption of photons.

The stability of atoms in quantum mechanics arises from the concept of the ground state.

The ground state is the lowest energy level that an electron can occupy, and it represents the most stable configuration for the atom. In this state, the electron does not emit any radiation and does not spiral into the nucleus.

The quantization of energy levels and the restrictions on electron transitions in quantum mechanics ensure the stability of atoms.

Electrons occupy specific energy levels and are confined to certain orbits around the nucleus, maintaining a balance between the attractive force of the nucleus and the centrifugal force of their motion.

Overall, quantum mechanics resolves the classical problem of instability in atoms by introducing the concept of quantized energy levels, which govern the behavior of electrons and prevent their collapse into the nucleus.

This understanding of atomic stability forms the basis for our modern understanding of the structure of matter and the functioning of atoms in chemical reactions.

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Answer:

She should use a measuring tape

Explanation:

A student measures her height with a meter stick and gets a result of 1.5 m tall. This may not be as accurate as possible due to the fact that a meter stick has a maximum length of 1m which means an error could have occurred when she had to mark a point and then measure the remaining 0.5m.

She can however measure her height with greater accuracy and precision with a meter tape which has a wider measurement range and there won’t be any need to measure twice.

Answer:

360 degrees is one full rotation starting at zero

it take 2 s  to the flag to rotate once in a full circle  with 3 rad/s of angular velocity.

Angular velocity is "rate of change of angular displacement with respect to time". i.e. ω= dθ/dt. it is also defined as angular displacement over time. i.e. ω = angular displacement/Time.

Angular velocity shows how much angle can be covered in unit time. It's SI unit rad/s.

Angular acceleration is rate of change of Angular velocity with respect to time.

i.e. α = dω/dt if an object changes its angular velocity in short time, we can say that it has greater angular acceleration. It is expressed in rad/s².

In this problem we have to calculate time, but the angular velocity id not given.

Consider the angular velocity is 3 rad/s.

Given,

Angular displacement θ = 2π

angular velocity ω = 3 rad/s

Time t = ?

Time = θ/ω

Time = 2π/3 rad/s = 2 s

Hence the answer is 2s.

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The water bath shouldn't grow too hot because a gain in temperature directly corresponds to a rise in pressure. (Volume remains constant)

ethyl alcohol - Think of the word EtOH. This phrase, which is used as a synonym for alcoholic beverages, comes from the chemical shorthand for ethyl alcohol.

Alcohol made from ethanol is referred to as ETOH. Alcohol is a family of several chemical substances that includes ethanol alcohol, often known as ethyl alcohol, grain alcohol, or simply alcohol. In addition to being a solvent, ETOH can be produced to make other compounds or added to gasoline.

Common medications like ranitidine, furosemide, mannitol, phenobarbital, co-trimoxazole, and paracetamol are known to contain ethanol in their formulations in the European Union (EU).

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Answer: The first option

Explanation: common sense

The Moon always rotates about the Earth in its orbit. The position of the Earth, moon and sun during a new moon is Earth is in between Sun and Moon.

When moon has travelled for 14 days, it starts its journey again for the next 14 days. The journey starts from the new moon to the full moon. The position of new and full moon is the same. At this time, the Earth is in between the Sun and the Moon.

Thus, the position of the Earth, moon and sun during a new moon is Earth is in between Sun and Moon.

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Based on the intrinsic brightness of stars, the correct statements are  option (1) There are stars with greater and lesser magnitude than the sun and option (3) To know how bright a star really is, you must first know its distance

1) There are stars with greater and lesser magnitude than the sun. It is true. The magnitude of a star is determined by its intrinsic brightness or luminosity, and some stars are more or less luminous than the sun, resulting in a higher or lower magnitude.

2) A star closer than 10 parsecs will have a brighter apparent magnitude than absolute magnitude. It is false. The apparent magnitude of a star depends on both its intrinsic brightness and its distance from Earth. However, the absolute magnitude of a star is defined as the magnitude it would have if it were located at a distance of 10 parsecs from Earth. Therefore, if a star is located closer than 10 parsecs, its apparent magnitude will be larger than its absolute magnitude.

3) To know how bright a star really is, you must first know its distance. It is true. The intrinsic brightness or luminosity of a star can only be determined if its distance from Earth is known. Without this information, it is impossible to distinguish between a bright star that is far away and a dim star that is close.

4) The absolute magnitude of a star is the same as its apparent magnitude at a distance of 10 parsecs. It is false. The absolute magnitude of a star is defined as the magnitude it would have if it were located at a distance of 10 parsecs from Earth. Therefore, if the apparent magnitude of a star is known, its absolute magnitude can be calculated by correcting for the distance using the inverse square law of brightness.

Therefore, the correct options are (1) There are stars with greater and lesser magnitude than the sun and (3) To know how bright a star really is, you must first know its distance

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a)  ΔHvap for this substance is: -10000 J/mol or -10.00 kJ/mol

b) The molar heat of vaporization for this substance is: 5000 J/mol or 5.00 kJ/mol

c) The substance is: Water.

a) The amount of heat released is given as 20.0 kJ, and the mass of the substance is 2.0 g.

To find ΔHvap, we need to convert the mass of the substance to moles by dividing it by its molar mass, and then use the equation: ΔH = q/moles.

The molar mass of water is 18.02 g/mol, so the number of moles is 2.0 g / 18.02 g/mol = 0.111 mol.

Therefore, ΔHvap = -20.0 kJ / 0.111 mol = -10000 J/mol or -10.00 kJ/mol.

b) The molar heat of vaporization is defined as the amount of heat required to vaporize one mole of a substance.

Since we know ΔHvap for this substance is -10.00 kJ/mol, the molar heat of vaporization is +10.00 kJ/mol.

c) The values obtained for ΔHvap and the molar heat of vaporization are consistent with water, indicating that the substance in question is water.

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The given question is incomplete, so an complete question is written below,

As the question is missing an important part, all the important possibilities which can fill the gap is written below,

a) What is ΔHvap for this substance?

b) What is the molar heat of vaporization for this substance?

c) What is the substance?

The Horizontal distance to floor  is 0.7246 m or 72.46 cm

The reflection of the nearest part of the floor will be seen at the bottom part of the mirror.

Vertical Distance of eyes - Vertical distance of bottom edge of mirror

= 1.62 - 0.4

= 1.22 m

Note that:

Tan(theta) = Perpendicular/Base

Tan(theta) = 1.22 / 2.21

= 0.552036

Taking the inverse of tan to find theta we get: Theta = 28.9°

90° - 28.9° = 61.1°

Based on the fact that the height of the mirror and angle of reflection of the beam are known, we can calculate the horizontal distance of the floor:

Tan (61.1°) = Horizontal distance to floor / height of mirror

Tan (61.1°) = Horizontal distance to floor / 0.4

Hence Horizontal distance to floor is 0.7246 m or 72.46 cm

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See full text below

A person whose eyes are H = 1.62 m above the floor stands L = 2.21 m in front of a vertical plane mirror whose bottom edge is 40 cm above the floor, shown below. What is the horizontal distance x to the base of the wall supporting the mirror of the nearest point on the floor that can be seen reflected in the mirror?

Answer:

According to the law of conservation of momentum:

Momentum of the car and insect system before collision = Momentum of the car and insect

system after collision

Hence, the change in momentum of the car and insect system is zero.

The insect gets stuck on the windscreen. This means that the direction of the insect is

reversed. As a result, the velocity of the insect changes to a great amount. On the other hand,

the car continues moving with a constant velocity. Hence, Kiran’s suggestion that the insect

suffers a greater change in momentum as compared to the car is correct. The momentum of

the insect after collision becomes very high because the car is moving at a high speed.

Therefore, the momentum gained by the insect is equal to the momentum lost by the car.

Akhtar made a correct conclusion because the mass of the car is very large as compared to

the mass of the insect.

Rahul gave a correct explanation as both the car and the insect experienced equal forces

caused by the Newton’s action-reaction law. But, he made an incorrect statement as the

system suffers a change in momentum because the momentum before the collision is equal to

the momentum after the collision.

The emission spectrum for the collection of quantum harmonic oscillators can be determined by considering the energy differences between the levels. Given that the spacing between levels is 0.4 eV, the energy differences between adjacent levels are also 0.4 eV.

To find the complete emission spectrum, we need to consider all possible energy transitions between the levels. Starting from the ground state, the transitions to higher energy levels will have energies of 0.4 eV, 0.8 eV, and 1.2 eV, respectively.

Thus, the emission spectrum will consist of photons with energies of 0.4 eV, 0.8 eV, and 1.2 eV. These energies correspond to wavelengths of approximately 3.10 μm, 1.55 μm, and 1.03 μm, respectively.

The emission spectrum for the system of quantum harmonic oscillators includes photon energies of 0.4 eV, 0.8 eV, and 1.2 eV, which correspond to infrared wavelengths.

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The moment of inertia of the boxer's forearm that has an angular acceleration of 125.0 rad / s² is 0.25 kg m²

τ = F * ⊥d

τ = Torque

F = Force

⊥d = Perpendicular distance

F = 1495 N

⊥d = 2.1 cm = 0.021 m

τ = 1495 * 0.021

τ = 31.395 N m

τ = I α

I = Moment of inertia

α = Angular acceleration

α = 125 rad / s²

I = τ / α

I = 31.395 / 125

I = 0.25 kg m²

Therefore, the moment of inertia of the boxer's forearm is 0.25 kg m²

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Answer:

wave reflection

Explanation:

An echo is an example of wave reflection. Reflection occurs when waves bounce back from a barrier they cannot pass through. Reflection can happen with any type of waves, not just sound waves.

C) Greater with the brick wall. Stopping force is determined by the amount of friction a surface provides.

Friction is a force that acts between two objects when they come into contact with each other. It is an important force that affects our everyday life. Friction can be both beneficial and detrimental. It is beneficial in that it allows us to walk, run, drive, and even write without slipping or sliding. It also helps us to stop when we need to. On the other hand, friction can be detrimental when it causes machines to wear down, resulting in energy being wasted. Friction can also cause heat, noise, and wear on the surfaces of the two objects.

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