Parameters and the nature of electromagnetic waves

  • Thread starter greg_rack
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  • #1
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Homework Statement:

Two electromagnetic waves P and Q travel in a vacuum and the ratio of their wavelengths is 1x10^8
Which row in the table shows the ratio of their speeds, the ratio of their frequencies, and
identifies the possible natures of P and Q?
I'll attach the table below

Relevant Equations:

v=f lambda
Schermata 2020-09-27 alle 23.31.17.png
By rearranging over and over ratio formulas involving frequency, speed and wavelength, I came up with the equation:
fP/fQ=10^-8xVP/VQ
This led me to take into account only rows A, B, E, and F... but I can't really understand which one of these is the right one.
 

Answers and Replies

  • #2
TSny
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Does the speed of light in vacuum depend on the wavelength?
 
  • #3
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Does the speed of light in vacuum depend on the wavelength?
Well, no, but isn’t “c” fixed even if not in a vacuum?
 
  • #4
TSny
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For this problem the light is traveling in a vacuum. So the speed is c for all frequencies.

When light travels in a material medium, the speed generally varies with frequency.
 
  • #5
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For this problem the light is traveling in a vacuum. So the speed is c for all frequencies.

When light travels in a material medium, the speed generally varies with frequency.
Oh, I didn’t know all electromagnetic waves were traveling at c in a vacuum!
And now, how could I find both frequencies in order to establish their natures?
If v=c=f•lambda, but c is fixed... is this formula still “working”? Should I use that?
 
  • #6
TSny
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If v=c=f•lambda, but c is fixed... is this formula still “working”? Should I use that?
Yes, definitely. :oldsmile:
 

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