State the speed of each of α,β and γ-radiations.
The electric field for an em wave is: E = E0sin[(12 x 1015 t – 4 x 107 x)]. What is the speed of the em waves?
A ray of light travelling from medium I in which speed of light is 2×108 m/s to a medium II in which speed of light is 1.5×108 m/s. Choose the correct ray diagram:
I. u=2×108 m/s
II. v=1.5×108 m/s
An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm, then find the speed of the wave.
The refractive index of water is 43. The speed of light in water is:
(Take the speed of light in air =3×108 ms−1)