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The red light emitted by a He-Ne laser has a wavelength of 633 nm in air and travels at...
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Any wave has three parameters, the velocity of the wave v, the frequency of the wave f and the wavelength w. These are related to each other by the relation v = w*f
The red-light of the He-Ne laser has a velocity 3*10^8 m/s. Its wavelength is 633 nm or 633*10^-9 m.
If the frequency of the wave is f, 3*10^8 = 633*10^-9*f
=> f = 3*10^8/633*10^-9 Hz
=> f = 4.739*10^14 Hz
The required frequency of the light emitted by the He-Ne laser is 4.739*10^14 Hz.
Posted by justaguide on February 11, 2012 at 10:55 AM (Answer #1)
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wavelength=633nm You have to change the unit nm to m
To do that you have to multiply by 10^-9
Posted by Jyotsana on February 21, 2014 at 11:28 PM (Answer #2)
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