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A beam of light of intensity I is incident on a plane mirror and get reflected fully as shown in figure. The pressure exerted by beam on the mirror is (c : speed of light)

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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>Q 9
A photosensitive metal plate is exposed to a monochromatic light beam of frequency which is more than threshold frequency. Then plot of dNdK versus K, is best represented by [N= No. of photoelectrons, K= kinetic energy of photoelectron]
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 10
When light of wavelength λ is incident on a metal surface, the stopping potential is found to be V0. When light of wavelength λn is incident on the same metal surface, the stopping potential is found to be n2V0. The cut off wavelength for the metal is given by
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 11
A metal surface is illuminated by light of two different wavelengths λ1=500 nm and λ2=620 nm. The maximum speed of ejected photoelectrons corresponding to these wavelengths are in the ratio 3: 2. Then work function of the metal is nearly
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 12
When a metal surface is illuminated with a radiation of wavelength λ1, the maximum kinetic energy of photoelectrons emitted is K. When the same surface is illuminated by radiation of wavelength λ2, the maximum kinetic energy of photoelectrons become 3 K. Then
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 8

Assertion : Work function of aluminium is 4.2eV. Emission of electrons will not be possible if two photons each of energy 2.5eV collide with free electrons of aluminium.

Reason : For photoelectric emission the energy of each photon should be greater than or equal to the work function of aluminium.

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 6
A perfectly reflecting solid sphere of radius r=30 cm is kept in the path of a parallel beam of light of large aperture. If the intensity of the beam is5π×103 W m-2, the force exerted by the beam on the sphere in scientific notation is p×10-qN. The value of 10p+q is
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 5
A metal sphere of radius 1 m and work function 3.14 eV is suspended from an insulating thread in free space. It is under continuous illumination of 300 nm wavelength of light. The maximum number of photoelectrons emitted is P×10Q (where 1<P<10). The value of Q is
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 8
In a photoelectric experiment threshold wavelength for metal is 380 nm. If wavelength of incident light is 260 nm, the stopping potential (in V) will be n4. Find the value of n in nearest integer.