Question

calculate the frequency and time period of an electromagnetic wave whose wave number is 7.8 m^-1​

Answer 1

wave no. = 1/ wavelength

wave length (λ)= 1/7.8 = 0.128 m

c = vλ

v= c/λ

v= 23.43 * 108 s-1

time period = 1/ frequency(v)

T= 1/ 23.43 * 108

T= 4.2 * 10-10 s

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