Question

# It takes time 8 min for light to reach from the sun to the earth surface. If speed of light is taken to be $$3 \times 10^{8} ms^{-1}$$, find the distance from the sun to the earth in km.

Solution

## Given:Time = 8 minSpeed = $$3 \times 10^{8} ms^{-1}$$Time is not given in the standard from, i.e., in seconds. So first convert to seconds;$$1 min$$ = $$60s$$$$8 min$$ = $$8$$ $$\times$$ $$60s = 480s$$Distance  $$=s$$ $$\times$$ $$t$$=  $$3 \times 10^{8} \times 480$$$$= 1.44 \times 10^{8} km$$Physics

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