MCQs of Dual Nature of Radiation and Matter

Dual Nature of Radiation and Matter MCQs

MCQs of Dual Nature of Radiation and Matter

Showing 131 to 140 out of 186 Questions

131.

The de Broglie wavelength of neutron at

927^{0} C

λ

. What will be its wavelength at

27^{0} C

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

132.

If the uncertainty in the position of an electron is 10^-10 m ,then the value of uncertainty in its momentum (in kg ms^-1) will be _____ .

(a)	3.33×10^-24
(b)	1.03×10^-24
(c)	6.6×10^-24
(d)	3.33×10^-26

133.

If the distance of 100 W lamp is increased from a photocell, the saturation current I in the photo cell varies with distance d as _____ .

(a)	$I α \frac{1}{d^{2}}$
(b)	$I α \frac{1}{d}$
(c)	$I α d$
(d)	$I α d^{2}$

134.

The uncertainty in the position of a particle is equal to the de Broglie wavelength. The uncertainty in its momentum will be _____ .

(a)	$\frac{h}{λ}$
(b)	$\frac{2 h}{3 λ}$
(c)	$\frac{λ}{h}$
(d)	$\frac{3 λ}{2 h}$

135.

On the basis of the uncertainty principle, it can be proved that _____ .

(a)	electron exists inside the nucleus
(b)	electron does not exist inside the nucleus
(c)	neutron exists inside the nucleus
(d)	proton exists inside the nucleus

136.

In practice, principle of uncertainty is applied _____ .

(a)	only for microscopic particles
(b)	only on general particles
(c)	on microscope particle
(d)	none of the above

137.

Principle of uncertainty show _____ .

(a)	a relation between momentum of particles and wave property
(b)	that to determine the exact value for both momentum and position of a particle is impossible.
(c)	that it is another statement of de Broglie hypothesis.
(d)	relation between velocity of matter wave and frequency.

138.

When a strong electric filed of approximately _____ is applied on the metal, the electron is pulled out from the metal.

(a)	$10^{1} \frac{V}{m}$
(b)	$10^{5} \frac{V}{m}$
(c)	$10^{3} \frac{V}{m}$
(d)	$10^{8} \frac{V}{m}$

139.

_____ on the emitter with respect to collector at which photoelectric current become zero is called stopping potential.

(a)	maximum negative potential
(b)	minimum negative potential
(c)	maximum positive potential
(d)	minimum positive potential

140.

In photoelectric effect, on allowing light to be incident on photo sensitive surface, the emission of electron takes place in nearly _____ time interval.

(a)	15
(b)	10^-3
(c)	10^-6
(d)	10^-9

Showing 131 to 140 out of 186 Questions