Question

Ultraviolet light from a distant star is traveling at 3.0 × 108 m/s. How long will it take for the light to reach Earth if it must travel 4.0 × 1013 km?

Answer 1

Answer : Time taken for the light to reach earth is $3.7\times 10^4\ Hours$

Explanation :

Given that,

Speed of Ultraviolet light, $v = 3\times 10^8\ m/s$

Distance covered by the light, $d = 4\times 10^{13}\ km=4\times 10^{16}\ km$

We have to find the time taken (t) by the light to reach on the surface of earth.

$t=\dfrac{d}{v}$

$t=\dfrac{4\times 10^{16}\ km}{3\times 10^8\ m/s}$

t = 133333333.333 seconds

$t=37037.03$

or

$t=3.7\times 10^4\ Hours$

Hence, this is the required solution.

Answer 2

C. 3.7x10^4 hours. See ya