Photoelectric Effect NEET Questions

Physics - Dual Nature of Matter and Radiation

Photoelectric Effect MCQ Questions


1.
The photoelectric effect was discovered by:
A.
Albert Einstein
B.
J.J. Thomson
C.
Heinrich Hertz
D.
Wilhelm Hallwachs
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ANSWER :
C. Heinrich Hertz
2.
Which scientist first explained the photoelectric effect?
A.
Albert Einstein
B.
Max Planck
C.
Isaac Newton
D.
Niels Bohr
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ANSWER :
A. Albert Einstein
3.
The photoelectric emission was studied in detail during 1886-1902 by:
A.
Hallwachs and Lenard
B.
Thomson and Bohr
C.
Einstein and Millikan
D.
Hertz and Maxwell
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ANSWER :
A. Hallwachs and Lenard
4.
In the photoelectric effect, electrons are ejected from a metal surface when it is exposed to:
A.
High temperature
B.
Strong magnetic field
C.
Light of sufficient frequency
D.
High pressure
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ANSWER :
C. Light of sufficient frequency
5.
Hallwachs concluded from his zinc plate experiment that:
A.
Positively charged ions are emitted by metals
B.
Negatively charged particles are emitted by metals under UV light
C.
Metals become magnetic under UV light
D.
Light becomes negatively charged near metals
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ANSWER :
B. Negatively charged particles are emitted by metals under UV light
6.
The minimum energy required to eject an electron from a metal surface is called:
A.
Threshold energy
B.
Kinetic energy
C.
Binding energy
D.
Activation energy
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ANSWER :
A. Threshold energy