# Question #2cf17

Nov 6, 2017

The source that produce them and methods of their detection are different, but they have the following common properties

#### Explanation:

• Electromagnetic waves are propagated by oscillating electric and magnetic fields oscillating at right angles to each other.

• Electromagnetic waves travel with a constant velocity of about $3$ x ${10}^{8}$ m/s in vacuum.

• Electromagnetic waves are not deflected by electric or magnetic fields.

• Electromagnetic waves can show interference or diffraction.

• Electromagnetic waves may be polarized and hence show transverse nature.

• The wavelength ($l a m \mathrm{da}$) and the frequency ($\nu$) of electromagnetic wave is related as
$c = \nu l a m \mathrm{da} = \frac{\omega}{k}$

• Electromagnetic radiation can travel through empty space. Most other types of waves must travel through some sort of a material substance. For example, sound waves need either a gas, solid, or liquid to pass through in order to be heard.

• The speed of light (and other EM waves) is always a constant. (Speed of light in vacuum : $2.99792458$ x ${10}^{8}$ m/s)

• Wavelengths are measured between the distances of either crests or troughs. It is usually characterised by the Greek symbol $l a m \mathrm{da}$.