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Chapter 17 - Photoelectric Effect

Total questions: 28

Worksheet time: 44mins

Name
Class
Date
1.
This image is an illustration of
a)
photoelectric effect
b)
Dalton's atomic theory
c)
Bohr model
d)
Quantum mechanical model
2.
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
3.

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.

4.

Photoelectric effect provides the evidence for the ______ nature of radiation.

a)

dual

b)

wave

c)

particle

d)

electromagnetic

5.

Light of a given wavelength is used to illuminate the surface of a metal. However, no photoelectrons are emitted. In order to cause electrons to be ejected, light of __________ should be used.

a)

lower energy

b)

higher intensity

c)

shorter frequency

d)

higher frequency

6.

What is the energy, in eV, of a photon that has a wavelength of 620 nm?

a)

1eV

b)

2eV

c)

3eV

d)

4eV

7.

Use the graph to find the threshold frequency.

a)

−12×10-19 Hz

b)

0 Hz

c)

2×1015 Hz

d)

4×1015 Hz

8.

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

9.

A metal with a work function of 3.5 eV is exposed to photons with an energy of 3.7 eV. What is the maximum kinetic energy of the emitted photoelectrons?

a)

0.2 eV

b)

0.9 eV

c)

1.1 eV

d)

7.7 eV

10.

What is the energy of a photon with a frequency of 5x1014 Hz? (you need to do calculation. You have enough time)

a)

2.5x10-19 J

b)

3.0x10-19 J

c)

3.3x10-19 J

d)

4.5x10-19 J

11.
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.
12.

What is the maximum kinetic energy of electrons emitted from caesium (Cs), when light of frequency 1x 1015 Hz falls upon the metal? (work function for Cs is 2.0eV)

a)

8.0x10-19 J

b)

4.0 eV

c)

2.0 x10-19 J

d)

2.0 eV

13.
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.
14.
The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The work function is determined by:
a)
the x-intercept.
b)
the y-intercept.
c)
the gradient.
d)
the area under the graph.
15.
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.
16.
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.
17.

A monochromatic light beam with a quantum energy of 9.0 eV is incident upon a photocell. The work function of the photocell is 4.1 eV. What is the maximum kinetic energy of the electron.

a)

4.2 eV

b)

4.4 eV

c)

4.7 eV

d)

4.9 eV

18.

In an experiment, photoelectric effect is observed in metal A when light with frequency (f ) falls on the metal. If the light frequency used in this experiment is doubled, the photoelectrons

a)

Will not be ejected

b)

Will be ejected as observed in the previous

c)

Will be ejected with greater number of photoelectrons

d)

Will be ejected with greater kinetic energy

19.

A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the 400 nm light is replaced by λ= 300 nm light of the same intensity, what is the result?

a)

More electrons are emitted in a given time interval

b)

Fewer electrons are emitted in a given time interval

c)

Emitted electrons are more energetic

d)

Emitted electrons are less energetic

20.

The SI unit of frequency is the __________.

a)

meter

b)

second

c)

hertz

d)

meter per second

21.

True or False? The wavelength and frequency of all waves are inversely proportional to each other.

a)

True

b)

False

22.
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.
23.

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.

24.
What is the maximum kinetic energy of electrons emitted from cesium (Cs), when light of frequency1015 Hz falls upon the metal? (work function for Cs is 1.8 eV)
a)
7.728x10-19 J
b)
4.83 eV
c)
1.864x10-19 J
d)
2.34 eV
25.
The cut-off wavelength for the photoelectric effect of platinum is 220 nm. Find the work function of platinum in eV
a)
11.25 eV
b)
9 eV
c)
4.5 eV
d)
5.65 eV
26.
Find the cut-off wavelength for the photoelectriceffect in tungsten (work function for tungsten is 4.5 eV)
a)
138 nm
b)
414 nm
c)
552 nm
d)
276 nm
27.

When light of specific frequencies is shined on a surface, electrons are ejected from the surface. This is the idea behind...

a)

Quantization of Energy

b)

Photoelectric Effect

c)

Compton Effect

d)

deBroglie Waves

e)

Uncertainty Principle

28.

A person cannot measure the location and the speed (momentum) of an object at the same time. This is the idea behind...

a)

Quantization of Energy

b)

Photoelectric Effect

c)

Compton Effect

d)

deBroglie Waves

e)

Uncertainty Principle

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