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Wavelength/Frequency short Questions help

  • Thread starter mmmboh
  • Start date
  • #1
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29fe5af.jpg


For a) I did frequency = speed of light / wavelength = 3.75x1014Hz
for b) I did 3.75x1014Hz x 10-15s=0.375
I think a) is right, but I don't know about b)
For c) I would have thought it is the same frequency as the first because I am taking it as if it is the same frequency, but a shorter amount of time, but I think this is wrong.

Help?
 

Answers and Replies

  • #2
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anyone please?
 
  • #3
ideasrule
Homework Helper
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For a) I did frequency = speed of light / wavelength = 3.75x1014Hz
for b) I did 3.75x1014Hz x 10-15s=0.375
10^-15 s is one femtosecond, not 20.

For c) I would have thought it is the same frequency as the first because I am taking it as if it is the same frequency, but a shorter amount of time, but I think this is wrong.
Have you tried the energy-time uncertainty principle?
 
  • #4
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Oh right, so I guess b) would be what I put times 20, so 7.5...
c) If that has anything to do with heisenberg's uncertainty principle, we haven't been taught that in this class, is there another way?
 
  • #5
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Or if I use that which equation should I use? I looked at it, but I'm not sure how it applies.
 
  • #6
407
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Hm I looked at the equations, and have found that [tex]1/2\delta T = 2.5x10^{13}hz[/tex] where delta T = 20 femtoseconds...is this correct?
 

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