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Exponents and Powers | Exponents and Powers Exercise 2.2

Question 7

A particular star is at a distance of about 8.1 ×10^{13}km from the Earth. Assuming

that the light travels at 3 × 108 m/sec, find how long does light take from that star to

reach the Earth.

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Given:

Distance between earth and a particular star = 8.1 × 1013 km

Speed of light = 3 × 108 m/sec.

Time is taken to reach the earth = (8.1 × 1013)/(3 × 108)

= 2.7 × 1016-8

= 2.7 × 108 sec

∴ Light takes 2.7 × 108 sec from star to reach the earth.

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subject-cta

Question 7

A particular star is at a distance of about 8.1 ×10^{13}km from the Earth. Assuming

that the light travels at 3 × 108 m/sec, find how long does light take from that star to

reach the Earth.

Looking to do well in your science exam ? Learn from an expert tutor. Book a free class!

Given:

Distance between earth and a particular star = 8.1 × 1013 km

Speed of light = 3 × 108 m/sec.

Time is taken to reach the earth = (8.1 × 1013)/(3 × 108)

= 2.7 × 1016-8

= 2.7 × 108 sec

∴ Light takes 2.7 × 108 sec from star to reach the earth.

Our top 5% students will be awarded a special scholarship to Lido.

subject-cta
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