Dual Nature of Radiation and Matter
Manipur Board · Class 12 · Physics
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What is the minimum energy required by an electron to escape from the surface of a metal called?
Who discovered the photoelectric effect?
What is the unit of work function?
According to Einstein's photoelectric equation, the maximum kinetic energy of photoelectrons depends on:
Sample Questions
Which of the following are types of electron emission? (Select all correct answers)
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Thermionic emission, Field emission, Photoelectric emission
The three main types of electron emission are: (1) Thermionic emission - by heating, (2) Field emission - by applying strong electric field, and (3) Photoelectric emission - by illuminating with light of suitable frequency.
What happens to the photoelectric current when the intensity of incident light is increased while keeping frequency constant?
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Current increases
Photoelectric current is directly proportional to the intensity of incident light. Higher intensity means more photons per second, leading to more photoelectrons being emitted per second, thus increasing the current.
Which of the following statements about threshold frequency are correct? (Select all correct answers)
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It is the minimum frequency for photoelectric emission, It depends on the nature of the metal, Below this frequency, no emission occurs regardless of intensity
Threshold frequency (ν₀) is the minimum frequency required for photoelectric emission. It depends on the work function and hence the nature of the metal. Below this frequency, no photoelectric emission occurs regardless of intensity.
The stopping potential in photoelectric effect is:
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Always negative
Stopping potential is the negative (retarding) potential applied to the collector plate to stop even the most energetic photoelectrons from reaching it. It must be negative to repel the negatively charged electrons.
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