MCQs of Dual Nature of Radiation and Matter

Dual Nature of Radiation and Matter MCQs

MCQs of Dual Nature of Radiation and Matter

Showing 41 to 50 out of 186 Questions

41.

The uncertainty in position of a particle is same as its de-Broglic wavelength, uncertainty in its momentum is .....

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

42.

A proton and electron are lying in a box having unpenetrable walls, the ratio of uncertainty in their velocities are ..... [

m_{e}

= mass of electron and

m_{p}

= mass of proton.]

(a)	$\frac{m_{e}}{m_{p}}$
(b)	$m_{e} \cdot m_{p}$
(c)	$\sqrt{m_{e} \cdot m_{p}}$
(d)	$\sqrt{\frac{m_{e}}{m_{p}}}$

43.

When

α

-particle are accelerated under the p.d of V volt, their de Broglie's wavelength is ......

A^{0}

[ Mass of -

α

particle is

6.4 \times 10^{- 27} kg

and its charge is

3.2 \times 10^{- 19} kg

(a)	$\frac{0.287}{\sqrt{V}}$
(b)	$\frac{12.27}{\sqrt{V}}$
(c)	$\frac{0.103}{\sqrt{V}}$
(d)	$\frac{1.22}{\sqrt{V}}$

44.

de-Broglie wavelength of a proton and α-particle is same, ..... physical quantity should be same for both.

(a)	velocity
(b)	energy
(c)	frequency
(d)	momentum

45.

To reduce de Broglie wavelength of an electron from 10^-10m to 0.5×10^-10m , its energy should be .....

(a)	increased to 4 time
(b)	doubled
(c)	halved
(d)	decreased to fourth part

46.

The de-Broglie wavelength of a proton and α-particle is same. The ratio of their velocities will be ......[ α-particle is the He-nucleus, having two protons and two neutrons. Thus, its mass m_α≈4m_p ; where m_p is the mass of the proton.

(a)	1:4
(b)	1:2
(c)	2:1
(d)	4:1

47.

The de-Broglie wavelength associated with a particle with rest mass

m_{0}

and moving with speed of light in vacuum is ......

(a)	$\frac{h}{m_{0} c}$
(b)	0
(c)	$\infty$
(d)	$\frac{m_{0} c}{h}$

48.

An image of sun is formed by convex lens of focal length 40 cm on the metal surface of a photoelectric cell and a photoelectric current I is produced. If now another lens with haft the focal length but with same diameter is used to focus the sun image on the photoelectric cell, photoelectric current become .......

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

49.

In quantum mechanics, a particle ......

(a)	can be regarded as a group of harmonic waves.
(b)	can be regarded as a single wave of definite wavelength only.
(c)	can be regarded as only a pair of two harmonic waves.
(d)	is a point-like object with mass.

50.

Which of the following physical quantity has the dimension of Planck constant (h) ?

(a)	Force
(b)	Angular momentum
(c)	Energy
(d)	Power

Showing 41 to 50 out of 186 Questions