Photoelectric Effect NEET Questions

Physical Chemistry - Atomic Structure

Photoelectric Effect MCQ Questions


13.
The threshold frequency for potassium metal is 5.0 × 10¹⁴ Hz. The work function of potassium is approximately:
A.
6.6 × 10⁻¹⁹ J
B.
3.3 × 10⁻²⁰ J
C.
3.3 × 10⁻¹⁹ J
D.
3.3 × 10⁻¹⁸ J
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ANSWER :
C. 3.3 × 10⁻¹⁹ J
14.
In photoelectric effect, the time lag between incidence of light and emission of photoelectron is:
A.
Several minutes
B.
About 10⁻⁹ seconds
C.
About 1 second
D.
Practically zero (instantaneous)
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ANSWER :
D. Practically zero (instantaneous)
15.
The energy of a photon is given by:
A.
E = hc
B.
E = mc²
C.
E = ½mv²
D.
E = hν
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ANSWER :
D. E = hν
16.
Which of the following statements about photoelectric effect is INCORRECT?
A.
Number of photoelectrons depends on intensity
B.
There is a threshold frequency for each metal
C.
KE of photoelectrons depends on frequency
D.
Photoelectrons are emitted with same KE for all metals
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ANSWER :
D. Photoelectrons are emitted with same KE for all metals
17.
Photoelectric current depends on:
A.
Frequency of incident light only
B.
Work function only
C.
Wavelength of incident light only
D.
Intensity of incident light
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ANSWER :
D. Intensity of incident light
18.
The work function of caesium is 1.9 eV. The threshold wavelength is:
A.
654 nm
B.
327 nm
C.
1308 nm
D.
163 nm
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ANSWER :
A. 654 nm