Hertz and Lenard's Observations NEET Questions

Physics - Dual Nature of Matter and Radiation

Hertz and Lenard's Observations MCQ Questions


1.
Who first observed the photoelectric effect experimentally?
A.
Albert Einstein
B.
Wilhelm Röntgen
C.
Heinrich Hertz
D.
Philipp Lenard
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ANSWER :
C. Heinrich Hertz
2.
Which scientist explained the photoelectric effect using the quantum theory of light?
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Philipp Lenard
D.
Albert Einstein
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ANSWER :
D. Albert Einstein
3.
Hertz's experiment with ultraviolet light showed that it could:
A.
Increase the frequency of light
B.
Increase the speed of electrons
C.
Induce a spark discharge
D.
Stop the emission of electrons
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ANSWER :
C. Induce a spark discharge
4.
According to Lenard's observations, the photoelectric current depends on:
A.
The intensity of incident light
B.
The wavelength of incident light
C.
The temperature of the cathode
D.
The type of metal used as the cathode
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ANSWER :
A. The intensity of incident light
5.
What was the key conclusion from Lenard’s experiment on the photoelectric effect?
A.
The energy of photoelectrons depends only on intensity
B.
The energy of photoelectrons depends on the frequency of light
C.
The number of emitted electrons depends on intensity
D.
The photoelectric effect contradicts classical wave theory
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ANSWER :
B. The energy of photoelectrons depends on the frequency of light
6.
Which of the following observations was made by Heinrich Hertz in 1887 regarding the photoelectric effect?

NEET - 2015

A.
Emission of X-rays from metals when exposed to ultraviolet light.
B.
Increase in the intensity of reflected light upon metal surfaces.
C.
Ejection of electrons from metal surfaces when exposed to ultraviolet light.
D.
Generation of electric current in metals due to thermal effects.
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ANSWER :
C. Ejection of electrons from metal surfaces when exposed to ultraviolet light.