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.
The photoelectric effect was first observed by:
A.
Max Planck
B.
Heinrich Hertz
C.
Robert Millikan
D.
Albert Einstein
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ANSWER :
B. Heinrich Hertz
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 photoelectric effect, electrons are emitted from a metal surface when:
A.
The metal is heated
B.
The metal is exposed to light of suitable frequency
C.
An electric field is applied
D.
A magnetic field is applied
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ANSWER :
B. The metal is exposed to light of suitable 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 frequency of light below which photoelectric effect does not occur is called:
A.
Threshold frequency
B.
Critical frequency
C.
Cut-off frequency
D.
Resonance frequency
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ANSWER :
A. Threshold frequency