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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Imagine you are out for a stroll on a sunny day when you encounter a lake. Unpolarized light from the sun is reflected off the lake into your eyes. However, you notice when you put on your vertically polarized sunglasses, the light reflected off the lake no longer reaches your eyes. What is the angle between the unpolarized light and the surface of the water, in degrees, measured from the horizontal? You may assume the index of refraction of air is nair=1 and the index of refraction of water is nwater=1.33 . Round your answer to three significant figures. Just enter the number, nothing else.
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