Photoelectric Effect NEET Questions

Physics - Dual Nature of Matter and Radiation

Photoelectric Effect MCQ Questions


7.
Photoelectrons are:
A.
Electrons emitted from a metal surface when light of suitable frequency falls on it
B.
Electrons in atomic orbits absorbing photons
C.
Photons emitted from excited atoms
D.
Positively charged particles emitted by hot metals
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ANSWER :
A. Electrons emitted from a metal surface when light of suitable frequency falls on it
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.
Which of the following metals are sensitive to visible light for photoemission?
A.
Lithium, sodium, potassium, caesium
B.
Iron, copper, silver
C.
Tungsten, platinum, gold
D.
Zinc, cadmium, magnesium
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ANSWER :
A. Lithium, sodium, potassium, caesium
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.
In the experimental study of the photoelectric effect, a quartz window is used because:
A.
It reflects ultraviolet light
B.
It is the cheapest transparent material
C.
It absorbs only visible light
D.
It permits ultraviolet radiation to pass through
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ANSWER :
D. It permits ultraviolet radiation to pass through
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