Photoelectric Effect NEET Questions

Physical Chemistry - Atomic Structure

Photoelectric Effect MCQ Questions


7.
Photoelectrons are:
A.
Electrons emitted from a metal surface when light of suitable frequency falls on it
B.
Electrons in atomic orbits absorbing photons
C.
Photons emitted from excited atoms
D.
Positively charged particles emitted by hot metals
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ANSWER :
A. Electrons emitted from a metal surface when light of suitable frequency falls on it
8.
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
9.
Which of the following metals are sensitive to visible light for photoemission?
A.
Lithium, sodium, potassium, caesium
B.
Iron, copper, silver
C.
Tungsten, platinum, gold
D.
Zinc, cadmium, magnesium
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ANSWER :
A. Lithium, sodium, potassium, caesium
10.
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
11.
In the experimental study of the photoelectric effect, a quartz window is used because:
A.
It reflects ultraviolet light
B.
It is the cheapest transparent material
C.
It absorbs only visible light
D.
It permits ultraviolet radiation to pass through
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ANSWER :
D. It permits ultraviolet radiation to pass through
12.
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