Chapter 7

NCERT
Class 9
Science
Solutions
5. During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal travels at the speed of light, that is, 3 × 108 ms–1

Question:

During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal travels at the speed of light, that is, 3 × 108 ms–1.

Answer:

Distance = time × speed

Time = 5 minutes × 60 = 300 seconds

Speed = 3 × 108 m/s

Distance = 300 × 3 × 108

= 9 × 1010 m

= 9 × 107 km

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