Name any two, electromagnetic waves, which have a frequency higher than that of violet light. State one use of each.

Name two electromagnetic waves of wavelength smaller than that of violet light. State one use of each.

State any one use of the magnet.

What is the wavelength of electromagnetic wave having frequency 1000 MHZ

The electromagnetic waves of frequency range 100 to 300 GHz are used in

(a) Name the high energetic invisible electro magnetic wave which helps in the study of the structure of crystals. (b) State one more use of the wave named in part (a).

An electromagnetic wave Y_1 , has a wavelength 1 cm while other electromagnetic wave Y_2 has a frequency of 10^15Hz . Name these two types of waves and write one useful application for each.

Statement-1 : Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communications using sky wave propagation. Statement-2: The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency.

Statement-I : Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communication using sky wave propagation Statement-II : The refractive index of the ionosphere becomes very high for frequency.

An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm. (a) Calculate the speed of the wave. (b) Name the medium through which it is travelling.

Electromagnetic waves with frequency greater than the critical frequency of ionosphere cannot be used for communication using sky wave propagation, because: