Photoelectric Effect NEET Questions

Physical Chemistry - Atomic Structure

Photoelectric Effect MCQ Questions


7.
The kinetic energy of photoelectrons depends on:
A.
Frequency of incident light
B.
Both intensity and frequency
C.
Neither intensity nor frequency
D.
Intensity of incident light
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ANSWER :
A. Frequency of incident light
8.
The number of photoelectrons emitted per second depends on:
A.
Wavelength of radiation only
B.
Intensity of incident radiation
C.
Work function only
D.
Frequency of incident radiation
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ANSWER :
B. Intensity of incident radiation
9.
If the frequency of incident light is less than the threshold frequency, then:
A.
Photoelectrons are emitted with high energy
B.
Photoelectrons are emitted with low energy
C.
No photoelectrons are emitted
D.
Photoelectrons are emitted slowly
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ANSWER :
C. No photoelectrons are emitted
10.
The work function of a metal is 2.5 eV. The threshold wavelength of the metal is approximately: (h = 6.6 × 10⁻³⁴ Js, c = 3 × 10⁸ m/s)
A.
310 nm
B.
496 nm
C.
620 nm
D.
248 nm
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ANSWER :
B. 496 nm
11.
Photoelectric effect supports which nature of light?
A.
Both wave and particle nature
B.
Wave nature only
C.
Particle nature only
D.
Neither wave nor particle nature
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ANSWER :
C. Particle nature only
12.
If intensity of incident light is doubled (frequency unchanged), the kinetic energy of emitted photoelectrons:
A.
Becomes four times
B.
Remains unchanged
C.
Becomes double
D.
Becomes half
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ANSWER :
B. Remains unchanged