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Graded Discussion Board (GDB) for the course PHY101 (PHYSICS) will start on Thursday 04th August, 2016.
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The topic for the discussion is:
“Justify the following statement
If you calculate the speed of light from a star that is moving toward you, you will get a higher value than if you calculate the speed of light from a star that is moving away from you?
Either yes or no, give a solid reason for its justification”
Elaborate your answer by giving a solid reason, give mathematical calculation (proof) where necessary.
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PHY101 GDB Due date 05-08-2016 | Yamf - VU Study Helper
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Here is answer of PHY101 GDB
We all know that the speed of light is not dependent on the motion of the observer. The speed of light does not vary with time or place whether a source of light is moving towards you or away from you the light still travels at 300,000 km/s.
GDB solution !
That is NOT true.According to Special Theory of Relativity ,speed of light is a constant in vacuum.If an object is moving away from you, the frequency is lower so that change in frequency will be negative. The wavelength will be longer that is called red shift.
If an object is coming towards the you, the frequency is higher, so that change in frequency will be positive. wavelength will be shorter. that is called blue shift.