Question

If the wavelength of red light is 800 nm then gind its freauency

Answer 1

Wavelength of red light = 800 nm

We know that, Speed of light = 3 x 10^8 m/s

∴ Frequency of light = Speed / Wavelength

= 3 x 10^8 m/s / 800 nm s

= 3 x 10^8 m/s / 8 x 10^-7 m

= 3 x 10^15 / 8 s

= 0.375 x 10^15 s^-1

= 3.75 x 10^14 Hz