What is the frequency of a helium-neon laser with a wavelength of 632.8 nm? The speed of light is 3.00 × 108 m/s.
wave length = 632.8nm = 632.8*10-9 m
velocity c= 3*108 m/sec
Frequency f = C/
= 3*108/632.8*10--9
= 0.00474 *1017 Sec-1
= 4.74*1014 Sec-1 >>>> answer
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