Dual Nature of Radiation and Matter  MCQs

MCQs of Dual Nature of Radiation and Matter

Showing 101 to 110 out of 186 Questions
8 9 10 11 12 13
101.
The wavelength of a 1 KeV photon is 1.24×10-9 m . Then the frequency of 1 MeV photon is _____ Hz.
(a) 2.4×1015
(b) 2.4×1020
(c) 1.24×1015
(d) 2.4×1020
Answer:

Option (b)

102.
A photon will have less energy, if its _____
(a) amplitude is higher
(b) frequency is higher
(c) wavelength is longer
(d) wavelength is shorter
Answer:

Option (c)

103.
It is essential to consider light as a stream of photons to explain _____ .
(a) diffraction of light
(b) refraction of light
(c) photoelectric effect
(d) reflection of light
Answer:

Option (c)

104.
Calculate the energy of a photon with momentum 33×10-13 kgms-1. Given planck's constant to be 6.6×10-34 Js.
(a) 7.3×104 J
(b) 9.9×10-5 J
(c) 1.3×105 J
(d) 8.1×103 J
Answer:

Option (b)

105.
The number of photons required to give a definite energy varies _____ .
(a) inversely as the wavelength
(b) inversely as the frequency
(c) directly as the frequency
(d) independent of the frequency
Answer:

Option (b)

106.
Which of the following statement about photon is incorrect ?
(a) Photons exert no pressure
(b) Momentum of photon is hfc
(c) Photon's rest mass is zero
(d) Photon's energy is zero
Answer:

Option (a)

107.
The energy of a photon in electron volt, whoes wavelength is 6600 Å is = _____ eV. h=6.625×10-34 Js
(a) 0.1875
(b) 1.882
(c) 18.75
(d) 1875
Answer:

Option (b)

108.
If h is planck's constant, the momentum of a photo of wavelength 0.01 Å is _____ Ns.
(a) 10-2 h
(b) 102 h
(c) h
(d) 1012 h
Answer:

Option (d)

109.
Momentum of a photon is p, then the corresponding wavelength _____ .
(a) hp
(b) ph
(c) ph
(d) hp
Answer:

Option (d)

110.
The energy of a photon of wavelength λ is _____ .
(a) hcλ
(b) hcλ
(c) λhc
(d) λhc
Answer:

Option (b)

Showing 101 to 110 out of 186 Questions
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