Dual Nature of Radiation MCQ with Answers

Dual Nature of Radiation MCQ with Answers

31) If the energy of a photon corresponding to a wave length of 6000?A⁰?is 3.32??10¹⁹?joule, the photon energy for a wavelength of 4000?A⁰

4.98?10¹⁹?joules

Explanation:

Use E =hc/(/lambda)

32) The work function for aluminium surface is 4.2 eV. The cutoff wavelength for the photo electric effect for the surface is

Answer is:

2955?A⁰

Explanation:

use W=hV_o

33) The work function of a photoelectric material is 3.32 eV. The threshold frequency will be equal to

Answer is:

8??10¹⁴?HZ

Explanation:

use W=hV_o

34) Light of wavelength 4000?A⁰?is incident on a metal plate whose work function is 2 eV. The maximum kinetic energy of the emitted photoelectrons would be

Answer is:

1.1eV

Explanation:

use W=hV_o and E = hc/(/lambda)

35) Given h = 6.6??10^?34?joule sec, the momentum of each photon in a given radiation is 3.3??10^?29?kg metre/sec. The frequency of radiation is

Answer is:

1.5??10¹³?Hz

Explanation:

use de brogli formula

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