Tag: the electromagnetic spectrum

$\beta$ -rays are streams of electron and cosmic rays are waves coming from space. So they are not electromagnetic waves.

All of the options are uses of UV Radiations. 

EM waves travel with the same speed in vacuum (or air) which is same as the speed of light ie. $\displaystyle 3\times { 10 }^{ 8 }m/s$

Sunlight is reffered as white light. It consist of seven colours,i.e VIBGYOR

Gamma Rays are most energetic Radiations. Since they have high penetrating power, they can cause fluorescence on fluorescent materials like ZnS.

Frequency of gamma rays is greater than $3 \times 10^{19} Hz$

Electromagnetic waves are transverse waves. The electromagnetic waves of entire wave length range do not require any material we drive for their propagation.

Radiowaves are used in-

EM waves exhibit the properties of reflection and refraction. In refraction, when an EM wave passes from one medium to the another, its direction to travel,speed and wavelength changes, but frequency remains unchanged.

EM waves are not deflected by electric and magnetic field. They exhibit the property of reflection and refraction.