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Monochromatic light of frequency 6.0 x 10¹⁴ Hz is produced by a laser. The power emitted is 2 x 10⁻³ ?. The number of photons emitted, on the average, by the sources per second is
Options
(a) 5 x 10¹⁶
(b) 5 x 10¹⁷
(c) 5 x 10¹⁴
(d) 5 x 10¹⁵
Correct Answer:
5 x 10¹⁵
Explanation:
Since P = nhv
n = p/hv = 2 x 10⁻³ / 6.6 x 10⁻³⁴ x 6.0 x 10¹⁴
= 5 x 10¹⁵
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The amplitude of S.H.M. y=2 (sin 5πt+√2 cos 5πt) is
- A ball moving with velocity 2 m/s collides head on with another stationary ball
- According to Bohr model of hydrogen atom, only those orbits are permissible
- A missile is fired for maximum range with an initial velocity of 20 m/s
- A metal conductor of length 1m rotates vertically about one of its ends at angular
Topics: Dual Nature of Matter and Radiation (150)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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