Question

4. The wavelength of light in air is 5000 A.U. The number
of waves in 50 cm of air is​

Answer 1

Answer:

Speed of light in air is 3*10^8 m/s

W = wavelength

N =refractive index of the medium =1.5

W in air =5000 A =5*10^-7 Metres

Frequency in air is 5*10^14 hz

So answer is 3000 A