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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
- A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating string
- Energy of all molecules of a monoatomic gas having a volume V and pressure P is 3PV/2.
- A mass m moving horizontally (along the x-axis) with velocity v collides and sticks
- Two straight wires each 10cm long are parallel to one another and seperated by 2 cm.
- Which of the following figures represent the variation of particle momentum
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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