Which one of the following electromagnetic radiations has the smallest wavelength?

(a) Ultraviolet waves

(b) X-rays

(c) y-rays

(d) Microwaves

(c)

Rays                             Wavelength  [Range in m]

        X-rays                       1 × 10^-11 to 3 × 10^-8

        Y-rays                       6 × 10^-14 to 1 × 10^-11

        Microwaves                10^-3 to 0.3

        Radio waves               10 to 10⁴

        Wavelength of U.V. Rays ranges from 6 × 10^-8 to 4 × 10^-7.