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Class XII Physics Dual Nature of Radiation and Matter Quiz 4

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Question 1

If the scattering intensity of a liquid is 8 units at a wavelength of 500 nm, then the scattering intensity at a wavelength of 400 nm will be approximately

Question 2

Photons of energy 7 eV are incident on two metals A and B with work functions 6 eV and 3 eV respectively. The minimum de Broglie wavelengths of the emitted photoelectrons with maximum energies are

and

, respectively where

is nearly

Question 3

Photons of wavelength

are incident on a metal. The most energetic electrons ejected from the metal are bent into a circular arc of radius R by a perpendicular magnetic field having a magnitude B. The work function of the metal is (where symbols have their usual meanings)

Question 4

Maximum velocity of the photoelectron emitted by a metal is 1.8×10⁶ ms^-1. Take the value of specific charge of the electron is 1.8×10¹¹ C kg^-1. Then the stopping potential in volt is

Question 5

Silver has a work function of 4.7 eV. When ultraviolet light of wavelength 100 nm is incident on it a potential of 7.7 V is required to stop the photoelectrons from reaching the collector plate. How much potential will be required to stop photoelectrons, when light of wavelength 200 nm is incident on it?

Question 6

Find the highest order of the Bragg’s diffraction for 2eV neutrons made to fall on a crystal with spacing 1.1

Question 7

Balmer gives an equation for wavelength of visible radiation of H^– spectrum as

. The value of k in terms of Rydberg’s constant R is

Question 8

Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV then the de-Broglie wavelength associated with the electrons would

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Mar 29JEE & BITSAT