Photoelectric Effect - Questions & Answers | Exam2Win

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1. The cut-off potential is a function of

A. the frequency of incident light

B. the intensity of incident light

C. the angle of incidence of incident light

D. the nature of photosensitive substance used

Explanation:

2. A proton and an alpha particle have equal momentum. If λ is the de Broglie wavelength of the proton, then the de Broglie wavelength of the alpha particle is

A. λ

B. λ/4

C. 4λ

D. λ/2

Explanation:

3. Einstein’s photoelectric equation is

A. hν - hνo = ½ mv2max

B. hνo - hν = ½ mv2max

C. hν = ½ mv2max

D. hν = hνo - ½ mv2max

Explanation:

4. In photo electric effect, emission of electrons is due to

A. electric field

B. thermal energy

C. electromagnetic radiation

D. applied potential difference

Explanation:

5. When the frequency of the incident light is less than the threshold frequency

A. a little photoelectric current is produced

B. a large photoelectric current is produced

C. no photoelectric current is produced

D. the velocity of the photoelectrons is large

Explanation:

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