Find the energy stored in a 60 cm length of a laser beam operating at 4 m W.
Answers
Answer:
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Explanation:
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Given:
Length of laser beam = 60 cm = 0.6 m
Laser beam operates at 4* 10⁻³ W.
Speed of light = c = 3 * 10⁸ m/sec ............(Already known)
To find :
Energy stored in laser beam
Solution:
First we find the time (t) required for light to travel through the beam.
Time = Distance/speed
t = 0.6/3*10⁸ sec
∴ t = 2 * 10⁻⁹ sec
We know that,
Energy = power * time
Energy = 4 * 10⁻³ Joule/sec ₓ 2 * 10⁻⁹ sec
Energy = 4 * 2 * 10⁻¹² Joule
Energy = 8 * 10⁻¹² Joule.
Answer:
The energy stored in a 60 cm length of a laser beam operating at 4* 10⁻³ W is 8 * 10⁻¹² Joule