MCQs of Dual Nature of Radiation and Matter

Dual Nature of Radiation and Matter MCQs

MCQs of Dual Nature of Radiation and Matter

Showing 21 to 30 out of 186 Questions

21.

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

22.

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

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

23.

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 ≈ 4 m_p; where m_p is the mass of the proton.]

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

24.

The de-Broglie wavelength associated with a particle with rest mass m₀ and moving with speed of light in vacuum is _____ .

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

25.

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 half the focal length but with same diameter is used to focus the sun image, on the photoelectric cell, photoelectric current becomes _____ .

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

26.

Cathode rays.....

(a)	are the atoms moving towards the cathod.
(b)	are electromagnetic waves.
(c)	are negative ions travelling from cathode to anode.
(d)	are electrons emitted by cathode and travelling towards anode.

27.

Degrees of freedom of harmonic oscillator = _____ .

(a)	2
(b)	5
(c)	3
(d)	7

28.

The velocity of photon emitted in photoelectric effect depends on the properties of photosensitive surface and .....

(a)	frequency of incident light.
(b)	state of polarization of incident light.
(c)	time for which the light is incident.
(d)	intensity of incident light.

29.

Photoelectric effect represents that .....

(a)	electron has a wave nature
(b)	light has a particle nature
(c)	(A) and (B) both
(d)	none of the above

30.

De-Broglic wavelength of a particle moving with velocity

2.25 \times 10^{8} {ms}^{- 1}

is same as the wavelength of photon. The ratio of kinetic energy of the particle to the energy of photon is .....

(a)	$\frac{1}{8}$
(b)	$\frac{3}{8}$
(c)	$\frac{5}{8}$
(d)	$\frac{7}{8}$

Showing 21 to 30 out of 186 Questions