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Question

It is estimated that a signal takes 1.27 seconds to reach the earth from the surface of the moon. Calculate the distance of the moon from the earth. Given speed of radio signal = 3× 108 m/s (speed of light in air).

A

3.81 * 108 km

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B

3.81 * 105 km

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C

3.81 * 105 m

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D

3.81 * 108 m

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Solution

The correct option is (A) and (B)

3.81 × 105 km

3.81×108 m

Step 1, Given data

Speed = 3 × 108 m/s

Time = 1.27 s

Step 2, Finding the distance traveled

We know,

Distance = speed × time

Putting all the values

Distance = 3 × 108 m/s × 1.27 s = 3.81 × 108 m = 3.81×108 m = 3.81 × 105km

Hence the total distance traveled is 3.81×108 m and 3.81×105km .


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