Hertz and Lenard's Observations NEET Questions

Physics - Dual Nature of Matter and Radiation

Hertz and Lenard's Observations MCQ Questions


7.
Which experiment first provided evidence of the photoelectric effect?
A.
Hertz’s experiment
B.
Lenard’s experiment
C.
Millikan’s oil-drop experiment
D.
Compton’s experiment
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ANSWER :
A. Hertz’s experiment
8.
In Hertz’s experiment, which factor influenced the emission of photoelectrons?
A.
Wavelength of light
B.
Frequency of light
C.
Intensity of light
D.
Angle of incidence
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ANSWER :
B. Frequency of light
9.
Lenard’s work showed that photoelectric current is directly proportional to:
A.
Frequency of incident light
B.
Intensity of incident light
C.
Wavelength of incident light
D.
Temperature of the metal
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ANSWER :
B. Intensity of incident light
10.
Philipp Lenard's experiments on the photoelectric effect led to which significant observation?

NEET - 2016

A.
The kinetic energy of emitted electrons depends on the intensity of incident light.
B.
The kinetic energy of emitted electrons is independent of the frequency of incident light.
C.
The kinetic energy of emitted electrons increases with the frequency of incident light.
D.
The number of emitted electrons decreases with increasing light frequency.
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ANSWER :
C. The kinetic energy of emitted electrons increases with the frequency of incident light.
11.
What was the main conclusion from Hertz’s experiment?
A.
Light behaves only as a wave
B.
Photoelectrons move with uniform velocity
C.
Light is composed of photons
D.
Light can be explained using classical mechanics
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ANSWER :
C. Light is composed of photons
12.
Lenard's observations suggested that photoelectrons are emitted:
A.
Instantaneously after light strikes
B.
After a certain time delay
C.
Only above a threshold frequency
D.
Only when intensity is high
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ANSWER :
A. Instantaneously after light strikes