Dual Nature of Radiation NEET Questions

Physics - Dual Nature of Matter and Radiation

Dual Nature of Radiation MCQ Questions


7.
Which scientists studied the photoelectric effect in detail during 1886-1902?
A.
Einstein and Planck
B.
Hertz and Maxwell
C.
Hallwachs and Lenard
D.
Compton and de Broglie
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ANSWER :
C. Hallwachs and Lenard
8.
Which metals are sensitive even to visible light for photoelectric emission?
A.
Zinc, cadmium, magnesium
B.
Tungsten, platinum, gold
C.
Lithium, sodium, potassium, caesium
D.
Iron, copper, silver
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ANSWER :
C. Lithium, sodium, potassium, caesium
9.
For a given frequency of incident light (above threshold), the photoelectric current is:
A.
Directly proportional to the intensity of incident light
B.
Independent of intensity
C.
Inversely proportional to intensity
D.
Proportional to square of intensity
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ANSWER :
A. Directly proportional to the intensity of incident light
10.
The stopping potential in photoelectric effect depends on:
A.
Distance of source from emitter
B.
Area of emitter plate
C.
Frequency of incident light and nature of emitter material
D.
Intensity of incident light only
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ANSWER :
C. Frequency of incident light and nature of emitter material
11.
The maximum kinetic energy of photoelectrons is related to stopping potential V₀ by:
A.
Kₘₐₓ = eV₀²
B.
Kₘₐₓ = V₀/e
C.
Kₘₐₓ = e²V₀
D.
Kₘₐₓ = eV₀
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ANSWER :
D. Kₘₐₓ = eV₀
12.
Below the threshold frequency, photoelectric emission:
A.
Occurs with reduced current
B.
Occurs only at very high intensity
C.
Occurs after a long time delay
D.
Does not occur no matter how intense the light is
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ANSWER :
D. Does not occur no matter how intense the light is