Question

If the distance between the sun and the earth is 1.5\times {{10}^{11}}m1.5×10 11 m and velocity of light is 3\times {{10}^{8}}m3×10 8 m s, then the time taken by a light ray to reach the earth from the sun is

Answer 1

$\bigstar$ Answer:

Given:

Distance (d) = 1.5 x 10¹¹ m

Speed (v) = 3 x 10⁸ m/s

To Find:

The time (t) taken by a light ray to reach the earth from the sun

Solution:

We know that,

$\boxed{\sf distance = speed \times time}$

Here,

We are asked to find time (t)

Therefore,

Rearranging the formula,

We get,

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

Given that,

d = 1.5 x 10¹¹ m

v = 3 x 10⁸ m/s

By Substituting the above values in the given equation,

We get,

$\implies \sf t = \dfrac{1.5 \times 10^1^1}{3 \times 10^8}\;sec$

$\implies \sf t = \dfrac{1}{2} \times 10^3 \;sec$

$\implies \sf t = 500 \;sec$

Hence,

The time taken by a light ray to reach the earth from the sun is 500 seconds

Further Information:

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