State the speed of each of α,β and γ-radiations respectively.
The speed of light in air is :
(a) 3×108 m s−1
(b) 330 m s−1
(c) 5100 m s−1
(d) 3×1010 m s−1
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)