in a photoelectric effect experiment you illuminate a metal with light of an unknown wavelength and measure the maximum kinetic energy of the photoelectrons to be 0.35 ev. then you illuminate the same metal with light of a wavelength known to be 2/3 of the first wavelength and measure a maximum kinetic energy of 2.4 ev for th

Answer:

A) Increased levels of atmospheric carbon dioxide

Explanation:

All of the other options are positive effects

Answer:

id.k

Explanation:

The magnitude of the RMS voltage output of the generator is 139.39 V.

The output voltage of a rotating circular coil is given by,

E = NBAW

Where,

E is the output voltage,

N is the number of the turns in the coil which is 450 in this case,

B is the magnitude of the magnetic field which is 0.32 tesla in this case,

A is the area of the circular ring,

W is the angular velocity of the coil which is 110 revolution/second.

A = πr²

A = π(0.053)²

A = 0.0088 m².

Putting values,

E = 450(0.32)(0.0088)(110)

E = 139.39 V.

So, the magnitude of the output voltage is 139.39 V.

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The beat frequency is 3 beats/sec.

Beat frequency(n) can be found by using the following formula:

n=f2-f1, where f2 and f1 are the given frequencies

n= 515-512

n= 3 beats/sec

Therefore the beat frequency when 512 Hz and 512Hz tuning forks are sounded together is 3 beats/sec.

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Answer: True? since it has a small hole it would depend on how far away the camera is to the object.

Answer:  5 years

Explanation:

Expression for rate law for first order kinetics is given by:

\(t=\frac{2.303}{k}\log\frac{a}{a-x}\)

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant  = x

a - x = amount left after decay process  = \(\frac{x}{16}\)

a) for calculating k

\(20=\frac{2.303}{k}\log\frac{x}{\frac{x}{16}}\)

\(k=\frac{2.303}{20}\log{16}\)

\(k=0.138years^{-1}\)

b) for calculating half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

\(t_{\frac{1}{2}}=\frac{0.693}{0.138years^{-1}}\)

\(t_{\frac{1}{2}}=5years\)

Thus its half life is 5 years

Answer:

D

Explanation:

physical properties are properties that can be measured with instruments, such as a scale for weight.

The descriptions are chemical properties

Gold's atoms have more protons than those of many other metals, it is a particularly dense metal. Statement D explains the physical characteristics of the constituent parts of a substance.

Density is defined as the mass per unit volume. It is an important parameter to understand the fluid and its properties. Its unit is kg/m³.

Gold is a relatively dense metal because its atoms have more protons than atoms of many other metals.

Statement D describes a physical property related to the particles that make up a material. Because density is the physical property of the material.

Hence option D is corect.

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An atom is the smallest unit of matter that forms a chemical element. An atom is made up of three kinds of subatomic particles: electrons, protons, and neutrons.A molecule is a combination of atoms bonded together through a covalent bond. Generally, we think of molecules as having no charge (although molecular ions do exist)

Answer:

the answer is k.E =0.5

Explanation:

i only think about it and i answer it

The drag force acting on the skydiver immediately after she has opened the parachute is 588 N

since we are provided with a coefficient which is 60.0 kg/m, the problem we are dealing with is related to drag force which is The resistance offered by a liquid, like water or air, which is called the drag force, when an object moves through it. It acts in a direction inverse to the object’s movement. It is produced by the relative speed between the strong object and the liquid. Whether the object or liquid is moving, drag happens as long as there's a difference in their speeds. Since it is safe to move, drag tends to moderate the object. A successful way to diminish it is to change the shape of the object and make it streamline.

Here the drag force is equal to  its weight,

F= mg = 60* 9.8 =588 N

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Answer:

The reason is because the pressure of the air inside the room drops with time which makes opening the door to require an increased amount of force to make up for the reduced pressure inside the room

Explanation:

From the kinetic theory of gases we have the following relation;

\(v_{rms} = \sqrt{\dfrac{3 \cdot K \cdot T}{m} }\)

\(p = \dfrac{n \cdot MW \cdot v^2_{rms} }{3 \cdot V}\)

Where:

K = Boltzmann constant

T = Temperature

m = Mass

MW = Molecular weight

V = Volume

\(v_{rms}\) = Root mean square velocity

Whereby the room door is closed, the kinetic energy of the air particles will be used up such that the average velocity of the particles will decrease, given that the volume of the room is constant, the pressure inside the room will drop below the original pressure outside the room such that the force on the door due to the outside pressure is larger than the force on the door from inside the room requiring a larger amount of force to overcome the resistance of the now higher outside pressure force.

Answer:

6 kg

Explanation:

p = mv

The velocity of the blood is 0.1925 m/s.

When blood flows back and forward, and creates a different frequency on the diagnostic ultrasound echo, the blood flow creates a doppler effect on the device. The formula

f₂ = f₁ × ((v ± vb) ÷ (v ± vb'))

The velocity of the blood is the same but in a different direction.

f₂ = f₁ × ((v ± vb) ÷ (v ± vb'))

2,000,500 = 2,000,000 × ((1,540 + vb) ÷ (1,540 - vb))

2,000,500 ÷ 2,000,000 = ((1,540 + vb) ÷ (1,540 - vb))

1.00025 = ((1,540 + vb) ÷ (1,540 - vb))

1.00025 (1,540 - vb) =  1,540 + vb

1,540.385 - 1.00025vb = 1,540 + vb

1,540.385 - 1,540 = vb + 1.00025vb

0.385 = 2.00025vb

vb = 0.385 ÷ 2.00025

vb = 0.1925 m/s

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Answer:

pie chart as it shows the whole

The given statement that explained the property of both light and sound is option a. They can be reflected.

Since the television generated the two types of the wave i.e. light and sound.

Also, the sound waves and the light waves should be reflected from the surfaces. So here the angle of incidence should be equivalent to the angle of reflection.

Therefore, the option a is correct.

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The reactance of the capacitor is 452.39 Ω, which represents the opposition of the capacitor to the flow of AC current in the circuit.

In AC circuits, the impedance of a capacitor is given by its reactance, which is represented by the symbol Xc. The reactance of a capacitor is dependent on the frequency of the applied voltage and the capacitance of the capacitor.

Use formula:

Xc = \(1 / (2 * \pi * f * C)\)

where π: mathematical constant pi, f: frequency of applied voltage, and C: capacitance of the capacitor.

In this case, the capacitance C is given as 35 μF (microfarads), and the frequency f is 60 Hz.

Put values:

Xc =\(1 / (2 * \pi * 60 * 35 * 10^(-6))\)

Xc = 452.39 Ω (ohms)

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Answer:

Here is the answer. Hope this helps you!

Explanation:

Average velocity is the sum of initial and final velocity divided by 2. I t is the same as total Displacement divided by total time. Average velocity is calculated when the body is in non-uniform motion (also when total displacement and time is not given). The formula is as follows:

u + v/2 = \(v_{av}\)

Average velocity = Average speed

during motion in a straight line. therefore, the above mentioned formula can be used for calculating average speed as well, when the direction is one and only the same, that is, during motion in a straight line. The S.I unit remains the same-

m/s.

Since velocity is vector, average VELOCITY is also vector. However, Average SPEED is scalar as speed is scalar. both can be equal only when the distance = displacement and when they are following the same direction of motion.

Observed temperature increases are best represented when it includes the influences of increases in greenhouse gases.

What are greenhouse gases ?

Greenhouse gases are gases in the atmosphere that affect the earth's energy balance. They cause the so-called greenhouse effect. Carbon dioxide (CO2), methane, and nitrous oxide, the best-known greenhouse gases, occur naturally in the atmosphere at low concentrations. However, since the beginning of the last century, its proportion has increased significantly due to various anthropogenic causes.

Besides these trace gases, which occur only in very low concentrations in the atmosphere, water vapor is probably the most important greenhouse gas. However, its ability to absorb water vapor from the air is directly related to temperature, so it only plays a major role with respect to the natural greenhouse effect. Therefore, water vapor contributes little to man-made climate change.

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I think unsaturated

because -

At 55°C, a saturated solution would contain 120 g of solute, NaNO3. (Notice, this point is exactly on the solute's curve). If, for example we mixed in 140 g of NaNO3 instead of 110 g of solute at 55°C, we would create a SUPER saturated solution, because we would be at a point ABOVE the solute's solubility curve.

By way of Ohm's Law, the voltage drop is proportional to the cutting-edge flowing thru a resistor. (So in numerous collection resistors with the same resistance, the drop across each one is identical, because the present day throughout each one is equal).

The connection between the current, voltage, and resistance is expressed through Ohm's regulation. This states that the modern-day flowing in a circuit is at once proportional to the implemented voltage and inversely proportional to the resistance of the circuit, provided the temperature stays steady.

Resistors in the collection deliver identical cutting-edge, however, the voltage drop throughout them isn't the same as their man or woman resistance values will create one-of-a-kind voltage drops across every resistor as decided by way of Ohm's regulation ( V = I*R ).

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Answer:

the answer is UV Radiation

Answer:

Icy roads

Explanation:

There is so little friction you slide on it way more than other roads. :)

Answer:

Wish I Had An Answer Try Checking On The Internet

Explanation:

Answer:

force=mass*acceleration

so consder in one second...

force=1.5kg*(changevelocity/time)

and you have the change in velocity per second.

acceleration= -20m/s^2

Explanation:

Answer:

Three Minute Step Test

Push Up

Zipper Test

Sorry di ko po alam lahat

Answer:

Coulomb = 100

Micro coulomb = 100 × 10^-6 = 10^-4 coulomb

Answer:

the answer is colloids.

The speed of the ball when it reaches the bottom of the 15 m hill is 17.15 m/s.

Speed is the rate of change of distance.

To calculate the speed of the ball. we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the speed of the ball is 17.15 m/s.

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Answer:

time speed accelaration negatives backwards

Explanation: