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Physics - EM Waves Question with Solution | TestHub

PhysicsEM WavesElectromagnetic wavesEasy2 minPYQ_2020

PhysicsEasysingle choice

A laser beam is sent to the moon and reflected back to earth by a mirror placed on the moon by an astronaut. If the moon is at $3, 84, 000 km$ distance from earth, how long does it take the light to make the round trip?

Options:

Answer:

Solution:

Given:
The distance of the moon $(s) = 384000 km$

$= 384000 \times 10^{3} m$

We known speed of light $(c) = 3 \times 10^{8} m/s$

Total time taken by the laser beam to make the round trip is

$t = \frac{2 s}{c} = \frac{2 \times 384000 \times 1000}{3 \times 10^{8}} = 2.5 s$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:EM WavesSubtopic:Electromagnetic waves

⏱ 2mℹ️ Source: PYQ_2020

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