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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
- Potentiometer measures the potential difference more accurately than a voltmeter
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- A spring balance is attched to the ceiling of lift.A man hangs his bag on the string
- The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV,
- If radius of the ₁₃Al²⁷ nucleus is taken to be Rᴀı, then the radius of ₅₃Te¹²⁵ nucleus
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Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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