Wavelength/Frequency short Questions help

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In summary, the conversation discusses the calculation of frequency using the speed of light and wavelength, with a question about the accuracy of a calculation using a shorter amount of time. The use of the energy-time uncertainty principle is suggested, but the person is unsure if it applies in this situation. Later, an equation is found and the frequency is calculated to be 2.5x10^13Hz.
  • #1
mmmboh
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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
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?
 
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  • #2
anyone please?
 
  • #3
mmmboh said:
29fe5af.jpg


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
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
Or if I use that which equation should I use? I looked at it, but I'm not sure how it applies.
 
  • #6
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?
 

FAQ: Wavelength/Frequency short Questions help

What is the relationship between wavelength and frequency?

The wavelength and frequency of a wave are inversely proportional to each other, meaning that as one increases, the other decreases. This relationship is described by the equation c = λν, where c is the speed of light, λ is the wavelength, and ν is the frequency.

How are wavelength and frequency measured?

Wavelength is typically measured in meters (m), while frequency is measured in hertz (Hz). However, in some cases, frequency may be measured in units such as cycles per second (cps) or revolutions per minute (rpm).

What is the difference between electromagnetic waves and sound waves in terms of wavelength and frequency?

Electromagnetic waves, such as light, have a much shorter wavelength and higher frequency compared to sound waves. Sound waves have wavelengths in the range of a few meters to a few centimeters, while electromagnetic waves have wavelengths ranging from a few nanometers to a few meters.

How do wavelength and frequency affect the properties of a wave?

The wavelength and frequency of a wave determine its properties, such as its energy, speed, and direction. Waves with shorter wavelengths and higher frequencies have more energy and travel at higher speeds compared to waves with longer wavelengths and lower frequencies.

Can the wavelength and frequency of a wave be changed?

Yes, the wavelength and frequency of a wave can be changed through various factors. For example, the medium through which a wave travels can affect its wavelength and frequency. Additionally, changing the source or energy of the wave can also alter its wavelength and frequency.

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