MCQs of Dual Nature of Radiation and Matter

Dual Nature of Radiation and Matter MCQs

MCQs of Dual Nature of Radiation and Matter

Showing 181 to 186 out of 186 Questions

181.

Power produced by a star is 4×10²⁸ W. If the average wavelength of the emitted radiation is considered to be 4500 Å, the number of photons emitted in 1 s is _____ .

(a)	1×10⁴⁵ Photons
(b)	9×10⁴⁶ Photons
(c)	8×10⁴⁵ Photons
(d)	12×10⁴⁶ Photons

182.

What should be the ratio of de-Broglie wavelengths of an atom of nitrogen gas at 300 K and 1000 K. Mass of nitrogen atom is 4.7×10^-26 kg and it is at 1 atm pressure. Consider it as an ideal gas.

(a)	2.861
(b)	8.216
(c)	6.281
(d)	1.826

183.

Monochromatic light of wavelength 3000 Å is incident normally on a surface of area

4 c m^{2}

. If the intensity of light is

150 \frac{mW}{m^{2}}

, the number of photons being on this surface in one second is _____ .

(a)	$9 \times 10^{13} s^{- 1}$
(b)	$8 \times 10^{13} s^{- 1}$
(c)	$7 \times 10^{13} s^{- 1}$
(d)	$11 \times 10^{13} s^{- 1}$

184.

A star which can be seen with naked eye from Earth has intensity 1.6×10^-9 W m^-2 on Earth. If the corresponding wavelength is 560 nm, and the diameter of the lens of human eye is 2.5×10^-3 m , the number of photons entering in our eye in 1 s is _____ .

(a)	7.85×10⁴ s^-1
(b)	8.85×10⁴ s^-1
(c)	7.85×10⁵ s^-1
(d)	8.85×10⁵ s^-1

185.

Find the velocity at which mass of a proton become 1.1 times its rest mass, m_p=1.6×10^-27 kg Also, calculate corresponding temperature. For simplicity, consider a proton as non-interacting ideal-gas particle at 1 atm pressure. (c=3×10⁸ ms^-1 , k_B=1.38×10^-23 SI )

(a)	ν=1.26×10⁸ m/s , T=6.75×10¹¹ K
(b)	ν=12.6×10⁸ m/s , T=7.655×10¹¹ K
(c)	ν=1.26×10⁷ m/s , T=5.76×10¹¹ K
(d)	ν=12.6×10⁷ m/s , T=7.56×10¹¹ K

186.

Output power of He-Ne LASER of low energy is 1.00 mW. Wavelength of the light is 632.8 nm. What will be the number of photons emitted per second from this LASER? (h=6.625×10^-34 J.sec)

(a)	8.31×10¹⁵ s^-1
(b)	5.38×10¹⁵ s^-1
(c)	1.83×10¹⁵ s^-1
(d)	3.18×10¹⁵ s^-1

Showing 181 to 186 out of 186 Questions