Radio waves and visible light in vacuum have

From the following, identify the electromagnetic waves having the maximum frequency? Radio waves Gamma rays visible light Microwaves Ultraviolet rays and Infrared rays.

From the following, identify the electromagnetic waves having the minimum frequency? Radio waves Gamma rays visible light Microwaves Ultraviolet rays and Infrared rays.

Write down one similarity and one dissimilarity between visible light and radio wave.

(A) Visible light can not be used to study crystals (R) The wave length of visible light is much smaller than the atomic dimensions

What is the ratio of velocities of two light waves travelling in vacuum and having wavelength 4000Å and 8000Å ?

Give the ratio of velocities of two light waves traveling in vacuum and having wavelengths 5000A^@ and 6000A^@ .