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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: - An electric charge 10⁻³ μC is placed at the origin (0,0) of X-Y co-ordinate system.
- The maximum kinetic energy of the photoelectrons depends only on
- A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane
- When photons of energy hν fall on an aluminium plate (of work function E₀),
- Three objects coloured black, gray and white can withstand hostile conditions upto 2800⁰C.
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An electric charge 10⁻³ μC is placed at the origin (0,0) of X-Y co-ordinate system.
- The maximum kinetic energy of the photoelectrons depends only on
- A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane
- When photons of energy hν fall on an aluminium plate (of work function E₀),
- Three objects coloured black, gray and white can withstand hostile conditions upto 2800⁰C.
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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