WorksheetsPhotoelectric Effect
Total questions: 15
Worksheet time: 45mins
Name
Class
Date
1.
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.
2.
Which statement about the photoelectric effect is correct?
a)
Electrons are emitted instantaneously.
b)
Electrons are not emitted below a certain wavelength.
c)
You can change the energy of the electrons by changing the intensity.
d)
Electron energy is independent of frequency.
3.
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.
4.
What must the minimum energy of photons falling ona copper plate be in order to observe the photoelectriceffect? (work function for copper 4.7 eV)
a)
2.35 eV
b)
1.175 eV
c)
4.7 eV
d)
9.4 eV
5.
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
6.
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
7.
The photoelectric effect is observed on barium oxide(BaO) at a minimum frequency of 0.24x1015 Hz . Find the work function of bariumoxide in eV.
a)
1 eV
b)
2 eV
c)
1.6 eV
d)
2.7 eV
8.
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
9.
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
10.
Green light with a wavelength of 5461 nm, emitted from a mercury lamp, ejects photoelectrons with a maximum kinetic energy of 0.13 eV from a metal surface. Calculate the work function of the metal.
a)
2.14 eV
b)
1.07 eV
c)
3.21 eV
d)
0.535 eV
11.
Green light with a wavelength of 5461 Å, emitted from a mercury lamp, ejects photoelectrons with a maximum kinetic energy of 0.13 eV from a metal surface.Calculate the cut-off frequency of the metal
a)
0.517x1015 Hz
b)
0.258x1015 Hz
c)
0.129x1015 Hz
d)
0.646x1015 Hz
12.
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?
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.
13.
Minimum frequency at which radiation causes the ejection of electrons from a metal
a)
stimulated emission
b)
photoelectric effect
c)
threshold frequency
d)
polarization
14.
Minimum frequency at which radiation causes the ejection of electrons from a metal
a)
stimulated emission
b)
photoelectric effect
c)
threshold frequency
d)
polarization
15.
This image is an illustration of
a)
photoelectric effect
b)
Dalton's atomic theory
c)
Bohr model
d)
Quantum mechanical model
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