Hertz and Lenard's Observations NEET Questions

Physics - Dual Nature of Matter and Radiation

Hertz and Lenard's Observations MCQ Questions


13.
What did Hertz observe in his experiment with ultraviolet light?
A.
Emission of electrons from a metal surface
B.
Increase in temperature of metal
C.
Formation of interference patterns
D.
Deflection of light waves
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ANSWER :
A. Emission of electrons from a metal surface
14.
According to Lenard's observations, which factor does NOT influence the kinetic energy of photoelectrons emitted from a metal surface?

NEET - 2017

A.
Frequency of the incident light.
B.
Intensity of the incident light.
C.
Work function of the metal.
D.
Wavelength of the incident light.
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ANSWER :
B. Intensity of the incident light.
15.
Lenard's experiment showed that the stopping potential depends on:
A.
The intensity of incident light
B.
The frequency of incident light
C.
The material of the cathode
D.
The angle of incidence of light
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ANSWER :
B. The frequency of incident light
16.
Which metal was commonly used in early photoelectric experiments?
A.
Copper
B.
Sodium
C.
Iron
D.
Gold
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ANSWER :
B. Sodium
17.
Hertz's observations led to the discovery of:
A.
Electromagnetic waves
B.
Electromagnetic induction
C.
Photoelectric effect
D.
Black body radiation
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ANSWER :
C. Photoelectric effect
18.
Heinrich Hertz's discovery of the photoelectric effect was significant because it demonstrated that:

NEET - 2018

A.
Light can be completely described as a wave phenomenon.
B.
Metal surfaces emit electrons only when heated to high temperatures.
C.
Ultraviolet light can induce the emission of electrons from metal surfaces.
D.
The intensity of light is the sole factor in electron emission from metals.
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ANSWER :
C. Ultraviolet light can induce the emission of electrons from metal surfaces.