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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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Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A spring has time period T. It is cut into n equal parts. The time period of each part
- Two metal rods 1 and 2 of same lengths have same temperature difference
- A wire is stretched under a force. If the wire suddenly snaps the temperature
- Small drops of the same size are charges to V volt each. If n such drops coalesce
- In a circuit, the current lags behind the voltage by a phase difference of π/2.
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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