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Photoelectric Effect

Total questions: 40

Worksheet time: 36mins

Name
Class
Date
1.

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

a)

dual

b)

wave

c)

particle

d)

electromagnetic

2.

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

3.

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

4.

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

a)

1eV

b)

2eV

c)

3eV

d)

4eV

5.

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

6.

Use the graph to find the threshold frequency.

a)

−12×10-19 Hz

b)

0 Hz

c)

2×1015 Hz

d)

4×1015 Hz

7.

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

8.

What does the slope of the graph represent?

a)

Speed of light

b)

Mass of a photon

c)

Planck's constant

d)

Stopping potential

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.

A particle of light is called a...

a)

Photoelectron

b)

Photon

c)

Proton

d)

Electron

11.

The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light

a)

Intensity

b)

Wavelength

c)

Frequency

d)

Energy

12.

What color of light has the greatest energy per photon?

a)

Red

b)

Green

c)

Blue

d)

Violet

13.

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.

14.
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.
15.
This image is an illustration of
a)
photoelectric effect
b)
Dalton's atomic theory
c)
Bohr model
d)
Quantum mechanical model
16.

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.

17.
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.
18.
The equation for the photoelectric effect is 
eV = hf - Φ
The graph of electron energy against frequency is
a)
a straight line through the origin
b)
 a straight line gradient h
c)
a straight line with a positive y intercept
d)
not a straight line
19.

The SI unit of frequency is the __________.

a)

meter

b)

second

c)

hertz

d)

meter per second

20.

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

21.

The energy of the emitted electron is ------------

a)

hf

b)

h/f

c)

hf + Wo

d)

hf - Wo

22.

The cut off (threshold) frequency is

a)

the highest frequency that releases electrons

b)

always in the red part of the spectrum

c)

always in the purple part of the spectrum

d)

different for different metals

23.

A surface has a work function of 4 x 10⁻¹⁹ J

What is the threshold wavelength?

h = 6.6 x 10⁻³⁴ Js

c = 3 x 10⁸ ms⁻¹

a)

6.0 x 10⁻¹⁴ m

b)

700nm

c)

5 x 10⁻⁷ m

d)

3 x 10⁻⁶ m

24.

Light of a single wavelength is incident on a metal. Electrons are released. The intensity of the light is then increased.

Which of the following changes occur?

a)

Rate of electron emission: increase.

Energy of electrons: increase.

b)

Rate of electron emission: decrease.

Energy of electrons: no change.

c)

Rate of electron emission: decrease.

Energy of electrons: increase.

d)

Rate of electron emission: increase.

Energy of electrons: no change.

25.

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.

26.

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.

27.

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

28.
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
29.
The energy of the emitted electrons was measured using a -----------------
a)
standing voltage
b)
striking voltage
c)
stopping voltage
d)
starting voltage
30.
This caused ------------------ to be emitted by the surface
a)
electrons
b)
photons
c)
waves
d)
plutons
31.
the energy of the photon is ---------------
a)
hf
b)
h/f
c)
hf + Φ
d)
hf - Φ
32.
The energy of the emitted electron is ------------
a)
hf
b)
h/f
c)
hf + Φ
d)
hf - Φ
33.
The energy of the emitted photon can also be worked out from the stopping voltage -----------
a)
V
b)
eV
c)
eV - Φ
d)
eV + Φ
34.
The cut off frequency is 
a)
the highest frequency that releases electrons
b)
always in the red part of the spectrum
c)
always in the purple part of the spectrum
d)
different for different metals
35.
the wavelength of a photon can be found using 
a)
λ = cf
b)
λ = hf
c)
λ = c/f
d)
λ = f/c
36.

The energy of a photon from an electromagnetic wave is 2.25 eV. Calculate its wavelength.

E=hcλE=\frac{hc}{\lambda}

  (1eV=1.60×10−19J)\left(1eV=1.60\times10^{-19}J\right)  

a)

765 nm

b)

7.65×10-26 m

c)

552 nm

d)

5.52×10-26 m

37.

In a photoelectric effect experiment it is observed that no current flows when the wavelength of EM radiation is greater than 570 nm. Calculate the work function of this material in electron- volts in eV.

W=hcλW=\frac{hc}{\lambda}  

(1.60×10−19J=1eV)\left(1.60\times10^{-19}J=1eV\right)  

a)

1.09 eV

b)

6.54 eV

c)

8.72 eV

d)

2.18 eV

38.

A photon with frequency of 1.5 x 10^15 Hz is incident on a piece of metal in the standard photoelectric experimental setup. What is the wavelength of this photon?

a)

20 nm

b)

150nm

c)

200nm

d)

500nm

39.

Who discovered Photoelectric Effect?

a)

Albert Einstein

b)

Richard D. Feinman

c)

Isaac Newton

d)

Debajyoti De

40.

When light of a certain frequency greater than the threshold frequency of a metal is directed at the metal, photoelectrons are emitted from the surface. The power of the light incident on the metal surface is doubled.


Which row shows the effect on the maximum kinetic energy and the number of photoelectrons emitted per second?

a)

Maximum kinetic energy: remains unchanged

Number of photoelectrons emitted per second: remains unchanged

b)

Maximum kinetic energy: doubles

Number of photoelectrons emitted per second: remains unchanged

c)

Maximum kinetic energy: remains unchanged

Number of photoelectrons emitted per second: doubles

d)

Maximum kinetic energy: doubles

Number of photoelectrons emitted per second: doubles

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