MCQs of Dual Nature of Radiation and Matter

Dual Nature of Radiation and Matter MCQs

MCQs of Dual Nature of Radiation and Matter

Showing 11 to 20 out of 186 Questions

11.

Energy of photon is E = h f and its momentum is p = \frac{h}{λ}, where λ is the wavelength of photon . With this assumption speed of light wave is

(a)	$\frac{p}{E}$
(b)	$\frac{E}{p}$
(c)	$E p$
(d)	${(\frac{E}{p})}^{2}$

12.

Wavelength λ_{A} and λ_{B} are incident on two identical metal plates and photo electrons are emitted . If λ_{A} = 2 λ_{B}, the maximum kinetic energy of photo electron is

_____

(a)	$2 K_{A} = K_{B}$
(b)	$K_{A} < \frac{K_{B}}{2}$
(c)	$K_{A} = 2 K_{B}$
(d)	$K_{A} > \frac{K_{B}}{2}$

13.

When frequencies f₁ and f₂ are incident on two identical photo sensitive surfaces, maximum velocities of photo electrons of mass m are v₁ and v₂, hence _____ .

(a)	${v_{1}}^{2} - {v_{2}}^{2} = \frac{2 h}{m} (f_{1} - f_{2})$
(b)	$v_{1} + v_{2} = {[\frac{2 h}{m} (f_{1} + f_{2})]}^{\frac{1}{2}}$
(c)	${v_{1}}^{2} + {v_{2}}^{2} = \frac{2 h}{m} (f_{1} + f_{2})$
(d)	$v_{1} - v_{2} = {[\frac{2 h}{m} (f_{1} + f_{2})]}^{\frac{1}{2}}$

14.

A proton and an α-particle are passed through same potential difference. If their initial velocity is zero, the ratio of their de Broglie's wavelength after getting accelerated is.

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

15.

Mass of proton in motion is _____

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

16.

If the momentum of an electron is required to be same as that of wave of 5200 Å wavelength, its velocity should be _____ m s^-1.

(a)	10³
(b)	1.2 × 10³
(c)	1.4 × 10³
(d)	2.8 × 10³

17.

Wavelength of an electron having energy 10 keV is _____ Å.

(a)	0.12
(b)	1.2
(c)	12
(d)	120

18.

The uncertainty in position of a particle is same as it's de Broglie wavelength, uncertainty in its momentum is ______

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

19.

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)	$\sqrt{\frac{m_{e}}{m_{p}}}$

20.

When α-particles are accelerated under the p.d. of V volt, their de Broglie's wavelength is _____ Å [ Mass of α-particle is 6.4 × 10^-27 kg and its charge is 3.2 × 10^-19 C. ]

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

Showing 11 to 20 out of 186 Questions