A photoelectric cell is illuminated by a point source of light 1 m away. When the source is taken 2m away
Correct answer: D. Each emitted electron carries half the initial energy
- A. The number of electrons emitted is a quarter of the initial number
- B. The number of electrons emittedis half the initial number
- C. Each electron emitted carries one quarter of initial energy
- D. Each emitted electron carries half the initial energy
Explanation
If distance from source becomes double then intensity of light and number of emitted electrons reduce to one fourth.
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About Photons and the Particle Model of Light
The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
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