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EP025 Topic 8: Quantization Of Light

Total questions: 20

Worksheet time: 23mins

Name
Class
Date
1.

A particle of light is called a...

a)

Photoelectron

b)

Photon

c)

Proton

d)

Electron

2.

How is a photon different from matter?

a)

A photon has no mass and travels at the speed of light.

b)

A photon has mass and travels at the speed of light.

c)

A proton has no mass and travels at the speed of light.

d)

A proton has mass and travels at the speed of light.

3.
This image is an illustration of
a)
photoelectric effect
b)
Dalton's atomic theory
c)
Bohr model
d)
Quantum mechanical model
4.
The photoelectric effect is when:
a)
Electrons collide inside a metal to release photons.
b)
One incident metal electron releases one photon.
c)
One incident photon releases one electron from a metal.
d)
Photons are absorbed in to metal ions releasing electrons.
5.

In photoelectric effect, electrons should be removed from the metal ______.

a)

inner shells

b)

surface

c)

from core

d)

nucleus

6.
The photoelectric effect only occurs if the light shining on the metal is:
a)
coherent.
b)
above a minimum intensity.
c)
above a minimum frequency.
d)
above a minimum wavelength.
7.

The energy of photoelectrons emitted from a metal surface can be increased by

a)

using light of higher frequency.

b)

using light of longer wavelength.

c)

using light of higher intensity.

d)

using monochromatic, polarized light.

8.

What is the best description of 'threshold frequency'?

a)

The minimum energy needed for electrons to escape a surface.

b)

The maximum kinetic energy that an emitted electron has.

c)

The minimum frequency of a photon that will cause an electron to be emitted.

d)

The frequency that an emitted electron will have.

9.
Does high-frequency or low frequency light cause the ejection of a greater number of electrons from a metal surface?
a)
only high frequency
b)
only low frequency
c)
both of them
d)
doesn't depend to frequency
10.

What color of light has the greatest energy per photon?

a)

Red

b)

Green

c)

Blue

d)

Violet

11.

If the brightness of a beam of light increases without changing its color, the ______ will increase.

a)

number of photons

b)

frequency of the light

c)

energy of the photons

d)

wavelength of the photons

12.

The energy of a photon is directly proportional to its _____ and inversely proportional to its ______.

a)

intensity - speed

b)

wavelength - frequency

c)

frequency - wavelength

d)

intensity - wavelength

13.

In the photoelectric effect, if the incident photons have a wavelength that is larger than the threshold wavelength, _______.

a)

electrons will be ejected from the metal surface

b)

there will be photoelectric current

c)

no electrons will be emitted from the metal surface

d)

the kinetic energy of the ejected electrons increases

14.
The energy of the emitted electrons was measured using a -----------------
a)
standing voltage
b)
striking voltage
c)
stopping voltage
d)
starting voltage
15.
To release an electron the energy of the photon had to be more than
a)
zero
b)
the cut off frequency
c)
the work function
d)
the cut off wavelength
16.

Energy absorbed by electron is used in

a)

A. escaping metal

b)

B. increasing kinetic energy

c)

C. both A and B

d)

D. increasing frequency

17.

In the formula, EK = hf - Φ, what does 'hf' represent?

a)

The photon energy of the incident light

b)

The kinetic energy of the emitted electron

c)

The threshold frquency

d)

The work function

18.
The diagram shows a circuit involving a photoelectric cell. When UV light is shone onto the metal cathode, electrons are emitted establishing a photocurrent.
Which of the following changes could cause the photocurrent to stop?
a)
Increasing the potential difference of the power supply.
b)
Increasing the frequency of the UV light.
c)
Increasing the intensity of the UV light.
d)
Changing the metal surface to one with a smaller work function.
19.
The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
Plank's constant is determined by:
a)
the x-intercept.
b)
the y-intercept.
c)
the gradient.
d)
the area under the graph.
20.
The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The threshold frequency is determined by:
a)
the x-intercept.
b)
the y-intercept.
c)
the gradient.
d)
the area under the graph.

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