(A)Increasing order of wavelength is (Micro waves > Radio waves >IR waves > visible waves > UV waves
(B)The order of Bohr radius is `(r_(n))`where n is orbit number for a given atom) `r_(1)`

(a) Arrange the following radiations in the order of their increasing wavelength: X-rays, infrared rays, radio waves, gamma rays, and micro waves. (b) Name the radiation which is used for satellite communication

Give two uses each of a) infra red rays b) micro wave c) radio waves.

The number of waves in the third orbit of H - atom is

The number of waves in n^("th") orbit are:

Number of waves made by a Bohr electron in one complete in its fourth orbit is

The wave motion of an electron in a Bohr's orbit of hydrogen atom is an shown in diagram. The orbit number is :

(A) : For long distance transmission of radio waves, short wave bands are used. (R) : Short waves are reflected from ionosphere.

The number of waves in the fourth bohr orbit of hydrogen is

(A) : The microwaves are better carriers of signals than radio waves. (R) : The electromagnetic waves do not require any medium for propagation.

(A) : The wave length of sound waves increases when they are refracted from air into water (R): Velocity of sound is greater in water than in air