(a) The distance to a star s approximately 7.20 X 10^18 m. If this star were to

Question

(a) The distance to a star s approximately 7.20 X 10^18 m. If this star were to bum out today, in how many years would we see t disappear? years (b) How long does t take for sunlight to reach Neptune? minutes (c) How long does t take for a microwave radar signal to travel from Earth to the Moon and back? s (d) How long does t take for a radio wave to travel once around the Earth In a great circle, close to the planets surface? s (e) How long does It take for light to reach you from a lightning stroke 8.4 km away? s

Explanation / Answer

part a )

t= d/v

t = 7.20 x 10^18 /3 x 10^8 = 2.4 x 10^10 s = 761.04 years

part b )

8.32 min

part c )

distance from moon = 3.8 x 10^8 m

distance there and back = 7.6 x 10^8 m

t = d/c = 2.53 s

part d )

distance = 2pi*r

t = distance /v = 0.134 s

part e )

t = d/v = 8,4 x 10^3 m / 3 x 10^8

t = 2.8 x 10^-5 s

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