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- 1. Multiple Choice
Photoelectric effect provides the evidence for the ______ nature of radiation.
wave
particle
dual
electromagnetic
- 2. Multiple Choice
In the photoelectric effect, if the incident photons have a wavelength that is larger than the threshold wavelength, ______.
there will be photoelectric current
electrons will be ejected from the metal surface
the kinetic energy of the ejected electrons increases
no electrons will be emitted from the metal surface
- 3. Multiple Choice
The energy of a photon is directly proportional to its ______ and inversely proportional to its ______.
intensity - speed
wavelength - frequency
frequency - wavelength
intensity - wavelength
- 4. Multiple Choice
A particle of light is called a……
Photon
Photoelectron
Proton
Electron
- 5. Multiple Choice
The energy of photoelectrons emitted from a metal surface can be increased by
using monochromatic, polarized light
using light of longer wavelength
using light of higher intensity
using light of higher frequency
- 6. Multiple Choice
The following observation are made about the photoelectric effect:
1. No electron are emitted below the threshold frequency.
2. Above the threshold frequency the energy of electrons depends on the frequency of the light.
3. Increasing intensity increases the number of emitted electrons.
4. Energy of electromagnetic radiation is quantised.
Which of these observations can be explained by a Planck's Quantum theory of light?
1 and 3 only
2, 3 and 4 only
1, 2 and 4 only
All of them
- 7. Multiple Choice
If the brightness of a beam of light increases without changing its colour, the ______ will increase.
number of photons
energy of the photons
frequency of the light
wavelength of the photons
- 8. Multiple Choice
What does the slope of the graph represent?
Stopping potential
Planck’s constant
Mass of photon
Speed of light
- 9. Multiple Choice
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:
the x-intercept
the y-intercept
the gradient
the area under the graph
- 10. Multiple Choice
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:
the x-intercept
the y-intercept
the gradient
the area under the graph
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