A star is 8.1 x 10¹³ km away from the earth. Suppose light travels at the speed
of 3.0 x 10⁵ km per second. How long will it take light from star to reach th
earth ?
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51
Answer:
Given:
- Distance = 8.1 × 10¹³ km
- Speed of light = 3 × 10⁵ Km/sec
- Time taken = ?
⇒ Distance = Speed × Time
⇒ Time = Distance / Speed
⇒ Time = 8.1 × 10¹³ km / 3 × 10⁵ Km/sec
⇒ Time = 2.7 × 10¹³⁻⁵
⇒ Time = 2.7 × 10⁸ seconds
Therefore the time taken for the light to reach earth from the star is 2.7 × 10⁸ seconds.
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