(a) How long in seconds does it take a radio signal to travel 180 km from a tran
ID: 1661101 • Letter: #
Question
(a) How long in seconds does it take a radio signal to travel 180 km from a transmitter to a receiving antemna? (b) We see a full Moon by reflected sunlight. How much earler did the light that enters ) What is the round-trip travel time in seconds for light between Earth and a leave the Sun? The Earth - Moon and Earth- Sun distances are 3.8x10 km and 1.5 x 10 km, respectively. (e light-years (m distant. How ago in years did the explosion actually occur? spaceship at a 4.1 × 10‘ km distance from Earth? (d) Suppose astronomers observe a suprea about 6600 o) Numbe ot (b) Number Units ITs 502 5333 (c) Numbet 27.333 Units Tf s a) Number 484 Units Tf years Oeen Show Work Click if you would like to Show Work for this question:Explanation / Answer
Answer:
(d) Given, distance d = 6600 light-years (ly) = 6.24 x 1017 m
speed of light c = 3 x 108 m/s
Therfore, time = d / c = (6.24 x 1017 m) / (3 x 108 m/s) = 2.08 x 109 s
One sec = 3.17 x 10-8 year, therefore time t = (2.08 x 109 ) (3.17 x 10-8 ) year = 65.9 years.
That means, 65.9 yr before the supernova explosion has happened.
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