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# PHY101 GDB will be closed on Friday 05th August, 2016

Graded Discussion Board (GDB) for the course PHY101 (PHYSICS) will start on Thursday 04th August, 2016.

You should remember that you have to post your comments about the discussion title within the time.

This discussion board will be closed on Friday 05th August, 2016.

No comment about the Discussion topic should be posted on the regular Moderated Discussion Board which is created for each lecture.

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.

Also you should remember that this Discussion is graded and maximum marks for this Graded Discussion Board 5% and it will count in your final Grade. So these marks may be helpful for you to get A grade from B and B grade from C and so on.

In the end you should also know that we will not extend the date of discussion in any case.

Plagiarism is prohibited that is why you are advised to avoid copy/paste from internet etc, if found at any stage will be graded as zero marks.
· All students are directed to use the font face Time new Roman and Font size 12.

Don’t use colorful back grounds in your solution.
Use Math Type or Equation Editor etc for mathematical symbols.
It also suggests you to keep your GDB solution safe from others. No excuse will be accepted by anyone if found to be copying or letting others copy.

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### Replies to This Discussion

PHY101 GDB SOLUTION

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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.

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