Question

The distance of a galaxy from Earth is of the order of 10²⁵ m. Calculate the order of magnitude of the time taken by light to reach Earth from the galaxy.

Answer 1

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# Answer- 10^16.

# Given-
Distance of galaxy from earth D = 10^25 m.
velocity of light v = 3×10^8 m/s

# Solution-
Time required for light to reach galaxy is given by,
Time = displacement/velocity
Time = (10^25)/(3×10^8)
Time = 3.33×10^16 s.

Order of magnitude of given value will be 10^16.

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Answer 2

Answer- 10^16.

Given-

Distance of galaxy from earth D = 10^25 m.

velocity of light v = 3×10^8 m/s

Solution-

Time required for light to reach galaxy is given by,

Time = displacement/velocity

Time = (10^25)/(3×10^8)

Time = 3.33×10^16 s.

Order of magnitude of given value will be 10^16

Explanation:

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