Q. 2

# Consider Galileo’

As we know,

Speed of light = 3 × 108 ms-1

According to the question,

To get an accuracy of about 10%, the time taken by the experimenter in closing or opening the shutter should be about one tenth (1/10) of the time taken by the light in going from one experimenter to the other.

Distance travelled by the light in 0.1s = 0.1s × 3 × 108 ms-1

=3×107 m

=3×104 km

Hence, difficulty in separation of that distance will be the curvature of the earth. As we know, the shape of the earth is an oblate spheroid, it has a curved surface. Because of the curvy property, light from one of the experimenters won’t reach the other.

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