Dual Nature of Matter and Radiation NDA Questions

NDA Physics

Dual Nature of Matter and Radiation MCQ Questions


1.
What phenomenon is explained by the wave nature of particles?
A.
Photoelectric effect
B.
Blackbody radiation
C.
Electron diffraction
D.
Rutherford scattering
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ANSWER :
C. Electron diffraction
2.
For which particles is the de Broglie wavelength significant?
A.
Macroscopic objects
B.
Very fast particles
C.
Microscopic particles
D.
Stationary particles
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ANSWER :
C. Microscopic particles
3.
What is the threshold frequency in the context of the photoelectric effect?
A.
The minimum frequency of light needed to eject electrons
B.
The maximum frequency of light that can be absorbed by a metal
C.
The frequency at which light does not affect the metal
D.
The frequency that produces the maximum current
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ANSWER :
A. The minimum frequency of light needed to eject electrons
4.
What is the stopping potential in a photoelectric experiment?
A.
The potential at which no electrons are emitted
B.
The potential at which the current is maximum
C.
The potential at which the kinetic energy of the ejected electrons is zero
D.
The potential at which the electrons are accelerated
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ANSWER :
C. The potential at which the kinetic energy of the ejected electrons is zero
5.
What is the work function of a metal?
A.
The energy required to remove an electron from the surface of the metal
B.
The energy gained by an electron upon entering the metal
C.
The energy required to move an electron within the metal
D.
The energy at which the metal starts to conduct
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ANSWER :
A. The energy required to remove an electron from the surface of the metal
6.
What determines the kinetic energy of photoelectrons?
A.
The intensity of the incident light
B.
The frequency of the incident light
C.
The temperature of the metal
D.
The type of metal
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ANSWER :
B. The frequency of the incident light