Physics, 10.03.2020 07:14 Derienw6586
(a) How long in seconds does it take a radio signal to travel 220 km from a transmitter to a receiving antenna? (b) We see a full Moon by reflected sunlight. How much earlier did the light that enters our eye leave the Sun? The Earth – Moon and Earth – Sun distances are 3.8x105 km and 1.5 × 108 km, respectively. (c) What is the round-trip travel time in seconds for light between Earth and a spaceship at a 7.5 × 108 km distance from Earth? (d) Suppose astronomers observe a supernova about 7200 light-years (ly) distant. How long ago in years did the explosion actually occur?
Answers: 3
, b) 
, c) 
, d) 7200 years ago.
. 
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