The frequency of light coming out from a laser source is 318 MHz. What is the wavelength corresponding to the light in meter provided that the speed of light inside the medium is 2.7 x10^8 m/s?

Answer 1

I think you have misread the question. 318 MHz is a radio wave (3.18 x 10^8 Hz). Light frequencies are in the 10^14 Hz range.

If you mean a 318 nm laser then we can first find the frequency

c=freq x wavelength

Freq = 9.44 x 10^14 Hz

Once it enters a medium, the frequency remains unchanged but the wavelength will change as it is moving slower.

v= freq x wavelength 2.7 x 10^8 = 9.44 x 10^14 x wavelength

The wavelength then becomes 286 nm