Photoelectric Effect NEET Questions

Physics - Dual Nature of Matter and Radiation

Photoelectric Effect MCQ Questions


7.
Which equation represents Einstein’s photoelectric equation?
A.
KE = hf
B.
KE = hf - ϕ
C.
KE = ϕ - hf
D.
KE = hf + ϕ
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ANSWER :
B. KE = hf - ϕ
8.
According to Einstein's photoelectric equation, the kinetic energy of the ejected electron is given by:
A.
hν - φ
B.
hν + φ
C.
hν × φ
D.
hν / φ
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ANSWER :
A. hν - φ
9.
What is the unit of work function?
A.
Joule
B.
Newton
C.
Volt
D.
Ampere
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ANSWER :
C. Volt
10.
Which of the following factors affects the kinetic energy of photoelectrons?
A.
Intensity of incident light
B.
Work function of the metal
C.
Temperature of the metal
D.
Angle of incidence
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ANSWER :
B. Work function of the metal
11.
Which factor affects the maximum kinetic energy of emitted photoelectrons?
A.
Intensity of light
B.
Frequency of light
C.
Speed of electrons
D.
Angle of incidence
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ANSWER :
B. Frequency of light
12.
What happens when the frequency of incident light is below the threshold frequency?
A.
Photoelectric emission increases
B.
Photoelectric emission decreases
C.
No photoelectric emission occurs
D.
Photoelectric emission remains constant
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ANSWER :
C. No photoelectric emission occurs