Wave:
A pattern of travelling energy like light or sound.

Length:
Measurement from end to end.

Wavelength:
Distance between corresponding points of same phase.

What does Wavelength depend on?
Wavelength and frequency are closely related.
Higher frequency have shorter wavelength.

What does relationship between frequency and wavelength?
All light waves through vacuum at same speed, the no of waves.

Units of Wavelength:
Meters.

What is Wavelength of light?
Visible light range 400 to 700 nm.

Color range:
Violet through Red.
Human eye is not capable of outside the radiations.

Wavelength of sound:
Human ear 20hz to 20 khz.

Sub-Wavelength:
Diameter less than wavelength of light.

Angular Wavelength:
Reduced wavelength.

Transverse Wave:
Perpendicular to wave.
Longitudinal Wave:

Parallel to wave.


Electromagnetic Wave:
Transmission of energy through vacuum.
Constant speed 3*10^8 m/s.
It is caused by Electromagnetic radiation.

Use of Electromagnetic Wave:
To transmit the energies.

Electromagnetic radiation:
Disturbance caused by electric and magnetic field.

Electric field:

Creates electrical charge in surroundings.

Electrical charge:
Experience a force in electromagnetic fields.

Types of  Electric charge:

Positive.
Negative.

Magnetic field:
Creates electric field around moving magnets.

Electromagnetic wave  ranges: