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प्रश्न
List out the laws of photoelectric effect.
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उत्तर
Laws of photoelectric effect:
- For a given frequency of incident light, the number of photoelectrons emitted is directly proportional to the intensity of the incident light. The saturation current is also directly proportional to the intensity of incident light.
- Maximum kinetic energy of the photoelectrons is independent of the intensity of the incident light.
- Maximum kinetic energy of the photoelectrons from a given metal is directly proportional to the frequency of incident light.
- For a given surface, the emission of photoelectrons takes place only if the frequency of incident light is greater than a certain minimum frequency called the threshold frequency.
- There is no time lag between the incidence of light and the ejection of photoelectrons.
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संबंधित प्रश्न
A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and `λ/2`. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the material is
The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is __________.
A light of wavelength 500 nm is incident on a sensitive metal plate of photoelectric work function 1.235 eV. The kinetic energy of the photoelectrons emitted is (Take h = 6.6 × 10–34 Js)
How does photocurrent vary with the intensity of the incident light?
Give the definition of intensity of light according to quantum concept and its unit.
Define stopping potential.
What is a surface barrier?
Explain the effect of potential difference on photoelectric current.
Calculate the energies of the photons associated with the following radiation:
- violet light of 413 nm
- X-rays of 0.1 nm
- radio waves of 10 m
When a light of frequency 9 × 1014 Hz is incident on a metal surface, photoelectrons are emitted with a maximum speed of 8 × 105 ms−1. Determine the threshold frequency of the surface.
