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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
- A projectile is thrown in the upward direction making an angle of 60°with the horizontal
- The point of suspension λ of a simple pendulum with normal time period T₁ is moving
- Magnetism of a magnet is due to
- The work done in rotating a magnetic of magnetic moment 2 A-m² in
- The coefficient of performance of a Carnot refrigerator working between 30⁰C and 0⁰C is
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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