(a) The distance to a star is approximately 6.20 times 10^18 m. If this star wer

Question

(a) The distance to a star is approximately 6.20 times 10^18 m. If this star were to burn out today, in how many years would we see it disappear? years (b) How long does it take for sunlight to reach Pluto? minutes (c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (d) How long does it take for a radio wave to travel once around the Earth in a great circle, close to the planet's surface? (e) How long does it take for light to reach you from a lightning stroke 9.9 km away?

Explanation / Answer

here,

Part A:
distance to star, d = 6.20*10^18 m

time, t = (6.20*10^18)/(3*10^8)

time, t = 20666666666.667 s

time, t = 20666666666.667/(365 * 24 * 60 * 60)

time, t = 655.336 yrs

Part B:
distance to pluto, d = 5.91*10^12 m

time, t = distance / speed of light

time, t = 5.91*10^12 /(3*10^8)

time, t = 19700 s

time, t = 19700 / 60

time, t = 328.33 min

part C:
distance to moon, d = 3.8*10^8 m

total diastance of coming and goibng, x = 2*3.8*10^8 m

time taken , t = distance/speed of light

time taken , t = 2*3.8*10^8 /(3*10^8)

time taken , t = 2.533 s

part d:

distance, d = 2 * pi * 6.37 * 10^6

time taken , t = distance/speed of light

time taken , t = (2 * pi * 6.37 * 10^6) /(3*10^8)

time taken , t = 0.133 s

part e:
distance, d = 9.9 km = 9900 m

time taken , t = distance/speed of light

time taken , t = (9900) /(3*10^8)

time taken , t = 3.3*10^-5 s

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