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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
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Maximum velocity of the photoelectrons emitted by a metal surface is 1.2×10⁶ ms⁻¹.
- A metal bar of length L and area of cross-section A is clamped between two rigid
- If a given volume of water in a 220V heater is boiled in 5 min, then same volume
- A common emitter amplifier gives an output of 3 V for an input of 0.01 V.
- In depletion layer of unbiased P-N junction
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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