Einstein's Photoelectric Equation(Particle Nature of Light) NEET Questions

Physics - Dual Nature of Matter and Radiation

Einstein's Photoelectric Equation(Particle Nature of Light) MCQ Questions


7.
More tightly bound electrons in a metal, when ejected by a photon of energy hν, will emerge with:
A.
Zero kinetic energy always
B.
Kinetic energies greater than Kₘₐₓ
C.
Kinetic energies less than Kₘₐₓ
D.
Exactly the same Kₘₐₓ
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ANSWER :
C. Kinetic energies less than Kₘₐₓ
8.
Einstein's equation explains why Kₘₐₓ depends linearly on frequency, NOT on intensity. This is because:
A.
Each photoelectron arises from absorbing exactly ONE photon of energy hν
B.
Frequency increases the work function
C.
The photon's wavelength changes the electron's mass
D.
Intensity changes the photon's energy
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ANSWER :
A. Each photoelectron arises from absorbing exactly ONE photon of energy hν
9.
From Kₘₐₓ = hν − φ₀, the condition for photoelectric emission to occur is:
A.
hν < φ₀
B.
hν > φ₀ (equivalently ν > ν₀)
C.
hν = 0
D.
Intensity > some threshold
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ANSWER :
B. hν > φ₀ (equivalently ν > ν₀)
10.
Einstein's photon picture explains why photoemission is INSTANTANEOUS because:
A.
Electrons in metals oscillate near the surface
B.
Photons travel infinitely fast
C.
A single photon-electron interaction is intrinsically instantaneous
D.
Light energy accumulates rapidly in waves
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ANSWER :
C. A single photon-electron interaction is intrinsically instantaneous
11.
Einstein's theory explains why photocurrent is proportional to intensity because:
A.
Higher intensity reduces work function
B.
Higher intensity = more photons per second = more electrons emitted per second
C.
Higher intensity = higher photon energy
D.
Higher intensity = stronger electric field on each electron
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ANSWER :
B. Higher intensity = more photons per second = more electrons emitted per second
12.
The threshold frequency ν₀ in Einstein's theory is given by:
A.
ν₀ = φ₀ × c
B.
ν₀ = h/φ₀
C.
ν₀ = φ₀/h
D.
ν₀ = hφ₀
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ANSWER :
C. ν₀ = φ₀/h