MCQs of Dual Nature of Radiation and Matter

Dual Nature of Radiation and Matter MCQs

MCQs of Dual Nature of Radiation and Matter

Showing 61 to 70 out of 186 Questions

61.

Suppose you are late in reaching the school, and you are going at the speed of 3.0 ms^-1. If your mass is 60 kg, assuming that you are a particle, find your de Broglie wavelength (h=6.625×10^-34 J.s)

(a)	6.38×10^-36m
(b)	8.68×10^-36m
(c)	3.68×10^-36m
(d)	8.86×10^-36m

62.

An electron is at a distance of 10 m from a charge of 10 C. Its total energy is 15.6×10^-10 J . Its de Broglie wavelength at this point is ...... (h=6.625×10^-34 Js, m_e= 9.1×10^-31 kg,K=9×10⁹ SI )

(a)	9.87 Å
(b)	9.87 fermi
(c)	8.97 Å
(d)	8.97

63.

When monochromatic light falls on a photo-sensitive material, the number of photo-election emitted per second is n and their maximum kinetic energy is K_max . If the intensity of the incident light is doubled, then_____ .

(a)	both n and K_max are doubled
(b)	both n and K_max are halved
(c)	n is doubled, but K_max remains the same
(d)	K_max is doubled, but n remains the same

64.

Two particle of masses m and 2 m have equal kinetic energies.Their de Broglic wavelength are in the ratio of _____ .

(a)	1:1
(b)	1:2
(c)	$1 : \sqrt{2}$
(d)	$\sqrt{2} : 1$

65.

Light of two different frequencies, whose photons have energies 2 eV and 10 eV respectively ,successively illuminate a metal of work function 1 eV. The ratio of the maximum speed of two emitted electrons will be _____ .

(a)	1:5
(b)	3:11
(c)	1:9
(d)	1:3

66.

de Broglie wavelength of a proton accelerated under potential difference of 100 V is

λ_{0}

. What will be the De Broglie wavelength of an

α

-particle accelerated under the same potential difference?

(a)	$2 \sqrt{2} λ_{0}$
(b)	$\frac{λ_{0}}{2 \sqrt{2}}$
(c)	$\frac{λ_{0}}{\sqrt{2}}$
(d)	$\frac{λ_{0}}{2}$

67.

when a point source of light is at a distance of 50 cm from a photoelectric cell, the stopping voltage is found to be

V_{0}

. If the same source is placed at a distance of 1 m from the cell, the stopping voltage will be _____ .

(a)	$\frac{V_{0}}{2}$
(b)	$\frac{V_{0}}{4}$
(c)	2 $V_{0}$
(d)	$V_{0}$

68.

The threshold wavelength for a metal having work function

W_{0}

λ_{0}

. What is the threshold wavelength for a metal whose work function is

\frac{W_{0}}{2}

(a)	$\frac{λ_{0}}{2}$
(b)	$\frac{λ_{0}}{4}$
(c)	$4 λ_{0}$
(d)	$2 λ_{0}$

69.

Which of the following has the longest de Broglie wavelength if they are moving with same velocity?

(a)	α-particle
(b)	β-particle
(c)	nentron
(d)	proton

70.

The wavelength of the matter waves is independent of _____ .

(a)	velocity
(b)	mass
(c)	charge
(d)	momentum

Showing 61 to 70 out of 186 Questions