(a) The distance to a star is approximately 5.00 x 10^18 m. If this star were to
ID: 2121327 • Letter: #
Question
(a) The distance to a star is approximately 5.00 x 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 the Earth?
___________minutes
(c) How long does it take for a microwave radar signal to travel from Earth to the Moon an back?
_____________s
(d) How long does it 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 lighting stroke 9.7 km away?
______________s
Explanation / Answer
a)5*10^18/(speed of light) =528.5 years
b) It takes 8.3 min for sunlight to reach earth
c)Distance/ speed =384400000/speed of light =2.56 sec
d) circumference of earth / speed of light = 40075000/3*10^8 =0.1335 sec
e)distance/speed of light = 9700/3*10^8 =30.2 micro sec.
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