Some distant galaxies are moving away from us at speeds greater than 0.5 c . What is the speed of the light received on Earth from these galaxies? Explain.
Some distant galaxies are moving away from us at speeds greater than 0.5 c . What is the speed of the light received on Earth from these galaxies? Explain.
Some distant galaxies are moving away from us at speeds greater than 0.5c. What is the speed of the light received on Earth from these galaxies? Explain.
Definition Definition Rate at which light travels, measured in a vacuum. The speed of light is a universal physical constant used in many areas of physics, most commonly denoted by the letter c . The value of the speed of light c = 299,792,458 m/s, but for most of the calculations, the value of the speed of light is approximated as c = 3 x 10 8 m/s.
Expert Solution & Answer
To determine
The speed of light received on Earth from distant galaxies.
Answer to Problem 1CQ
The speed of light received on Earth from distant galaxies is
c.
Explanation of Solution
According to second postulate of relativity, the light travels with same speed, regardless of whether the source or the observer is in motion or not.
The distant galaxies are moving away from us at speeds greater than
0.5c. The light received on Earth coming from these galaxies will be received at the speed of light in accordance with the second postulate of relativity.
The motion of galaxies relative to Earth will not have any effect on the speed of light coming from these galaxies according to the second postulate of relativity.
Conclusion:
Therefore, the speed of light received on Earth from distant galaxies is
c.
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