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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
Related Questions: - The velocity of a particle at an instant is 10 ms⁻¹ and after 5 s the velocity
- If L and C denote inductance and capacitance,then the dimensions of L-C are
- An inclined plane of length 5.60m making an angle of 45⁰ with the horizontal is placed
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Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The velocity of a particle at an instant is 10 ms⁻¹ and after 5 s the velocity
- If L and C denote inductance and capacitance,then the dimensions of L-C are
- An inclined plane of length 5.60m making an angle of 45⁰ with the horizontal is placed
- A solid cylinder of mass 50kg and radius 0.5 m is, free to rotate about the horizontal axis
- A particle moves along the x-axis from x=0 to x=5 m under the influence of a force
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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