Photoelectric Effect NEET Questions

Physical Chemistry - Atomic Structure

Photoelectric Effect MCQ Questions


1.
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
2.
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
3.
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
4.
Who explained the photoelectric effect using quantum theory?
A.
Albert Einstein
B.
Niels Bohr
C.
Max Planck
D.
Heinrich Hertz
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ANSWER :
A. Albert Einstein
5.
Einstein's photoelectric equation is:
A.
hν = hν₀ - ½mv²
B.
hν₀ = hν + ½mv²
C.
hν = hν₀ + ½mv²
D.
½mv² = hν₀ + hν
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ANSWER :
C. hν = hν₀ + ½mv²
6.
The minimum energy required to eject an electron from the metal surface is called:
A.
Ionization energy
B.
Kinetic energy
C.
Activation energy
D.
Threshold energy or work function
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ANSWER :
D. Threshold energy or work function