Question

The Earth is approximately 150 million kilometers away from the Sun. If light travels at a speed of approximately 300,000 kilometers per second, about how long does it take for light from the Sun to reach the Earth?

Answer 1

Answer:

about 10 minutes

Explanation:

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Answer 2

The correct answer to the question is 8.33 minutes.

CALCULATION:

The distance of earth from sun s = 150 million km.

We know one million = 10 lakh = $10^6$

Also 1 km = $10^3\ m$

Hence, the distance s = $150\times 10^6\times 10^3\ m$

                                     = $15\times 10^{10}\ m$

The speed of light c = 300,000 km per second

                                  = $3\times 10^8\ m/s$

We are asked to calculate the time.

The time of the reaching earth is calculated as -

                                         $time=\ \frac{distance}{velocity}$

                                         $t=\ \frac{s}{c}$

                                                $=\ \frac{15\times 10^{10}} {3\times 10^8}\ second$

                                                $=\ 500\ seconds$

We know one minute = 60 second.

Hence, 500  seconds = $\frac{500}{60}\ minute$

                                     = $8.33\ minute$       [ans]