(a) The distance to a star is approximately 7.10 X 10^18 m. If this star were to
ID: 2029172 • Letter: #
Question
(a) The distance to a star is approximately 7.10 X 10^18 m. If this star were to burn out today, in how many YEARS would we see it disappear?(b) How long does it take for sunlight to reach Venus? Give Answer in Minutes
(c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? Give answer in seconds
(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? Give Answer in seconds
(e) How long does it take for light to reach you from a lightning stroke 8.9 km away?
Give answer in seconds
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Explanation / Answer
( a )
t = d /c ;
t = 7.1 e 18 / 299792458
t = 2.368 e 10 s ;
t = [ 2.368 e 10 / [ 3600 * 24 * 365 ] ] yrs
t = 750.984 yrs <-------ans
( b )
d = 107 e 9 m
t = d /c ;
t = 107e9 / 299792458
t = 356.913 s
t = 356.913 / 60 min = 5.948 min <--------ans
( c )
distance of moon from earth = 3.84 e 8
t = 2 * 3.84 e 8 / c
t = 2.5617 s <--------ans
( d )
t = ( 2 r ) / ( c ) ;
t= ( 2 * 6.4 e 6 ) / ( c ) ;
or t = 0.134134 s <------ans
( e )
t = 8.9 e 3 / c ;
t = 2.968 e -5 s <----------ans
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