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WorksheetsB. Sc. III Photoelectric effect
Total questions: 10
Worksheet time: 5mins
Which Year Einstein got Nobel prize in Physics
1921
1924
1920
1930
Which elementary particles are emitted in Photo electric effect
Proton
Electron
Neutron
Neutrino
The graph shows how the maximum kinetic energy Ek of photoelectrons emitted from a metal surface varies with the reciprocal of the wavelength λ of the incident radiation.
What is the gradient of this graph?
c
h
hc
h/c
Photons of wavelength 290 nm are incident on a metal plate. The work function of the metal is 4.1 eV.
What is the maximum kinetic energy of the emitted electrons?
0.19 eV
4.3 eV
6.9 eV
8.4 eV
Which statement suggests that electrons have wave properties?
Electrons are emitted in photoelectric effect experiments.
Electrons are released when atoms are ionised.
Electrons produce dark rings in diffraction experiments.
Electron transitions in atoms produce line spectra.
Photons of wavelength 290 nm are incident on a metal plate. The work function of the metal is 4.1 eV.
What is the maximum kinetic energy of the emitted electrons?
0.19 eV
4.3 eV
6.9 eV
8.4 eV
In an experiment to demonstrate the photoelectric effect, a charged metal plate is illuminated with light from different sources. The plate loses its charge when an ultraviolet light source is used but not when a red light source is used.
What is the reason for this?
The intensity of the red light is too low.
The wavelength of the red light is too short.
The frequency of the red light is too high.
The energy of red light photons is too small.
When comparing X-rays with UV radiation, which statement is correct?
X-rays have a lower frequency.
X-rays travel faster in a vacuum.
X-rays do not show diffraction and interference effects.
Using the same element, photoelectrons emitted using X-rays have the greater maximum kinetic energy.
Line X on the graphs below shows how the maximum kinetic energy of emitted photoelectrons varies with the frequency of incident radiation for a particular metal.
Which graph shows the results for a metal Y that has a higher work function than X?
A
B
C
D
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
B
C
D
