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Photons are incident from vacuum on a transparent material with a refractive index 1.50 for a given wavelength. The momentum of the incident photon, if its wavelength in the material is equal toλ, is hnλ. Value of n, is

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Important Questions on Dual Nature of Radiation and Matter

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 48
Energy from the sun is received on the earth at the rate of 2cal/cm2/min. If average wavelength of solar light be taken at 5500 Å, then photons received on the face of earth facing the sun in 1 hour (approx.), is 1.76×10N. Value of N, is
(1 cal = 4.2 J, Radius of earth =6400 km ).
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 49
An electron of mass m when accelerated through a potential difference V, has a de Broglie wavelength λ. The de Broglie wavelength associated with a proton of mass M accelerated through a potential difference 4 V will be λnmM.
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 50
A beam of light of flux density 30 kW/m2 is incident normally on a 100 mm2 completely absorbing screen. If P is the pressure exerted on the screen, then P=10-n N/m2. Value of n, is
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 63
Light of wavelength 2000 Å falls on a metallic surface whose work function is 4.21 eV. Calculate the stopping potential.
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 42
When ultraviolet radiation is incident on a surface, no photoelectrons are emitted. It is possible to cause emission by using
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 2
The kinetic energy of the most energetic photo-electron emitted from a metal surface is doubled when the wavelength of the incident radiation is reduced from λ1 to λ2. The work function of the metal is
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 3
When a certain photosensitive surface is illuminated with monochromatic light of wavelength λ, the stopping potential for photoelectric current is 2V0. When the same surface is illuminated with monochromatic light of wavelength 2λ, the stopping potential is V02. The threshold wavelength for photoelectric emission is:
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 4
For a photoelectric cell, the graph in figure showing the variation of the cut-off voltage V0 with frequency (v) of incident light is