What is time taken by radio wave to go and return back from communication satellite to earth??​

Radio waves are used to carry satellite signals. These waves travel at 300,000 km/s (the speed of light). This means that a signal sent to a satellite 38,000 km away takes 0.13 s to reach the satellite and another 0.13 s for the return signal to be received back on Earth.

Explanation:

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the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

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