Y9 Science Term 2 Revision Notes (1 of 4)

wave motion

the transfer of energy without transferring matter.

electromagnetic radiation

electromagnetic waves consisting of oscillating electric & magnetic fields travelling at the speed of light.

electromagnetic waves

transverse electric & magnetic fields positioned at right angles to each other, travelling through empty space.

electromagnetic spectrum

the entire range of frequencies of electromagnetic radiation.

Radio Waves

a type of electromagnetic radiation that has long wavelengths and low frequencies

Microwaves

a type of electromagnetic radiation that is higher than radio waves but lower than infrared waves on the electromagnetic spectrum.

Infrared Radiation

Electromagnetic radiation with wavelengths slightly longer than visible light, detected by skin as heat.

Visible Light

Electromagnetic radiation that can be seen by our eyes.

Ultra Violet Light

Electromagnetic radiation with frequencies just above visible light.

X-Rays

high frequency Electromagnetic radiation that can penetrate materials.

Gamma Rays

extremely high-frequency electromagnetic radiation emitted by radioactive materials.

frequency of waves

measured in hertz (Hz).

highest energy electromagnetic radiation

gamma rays.

lowest energy electromagnetic radiation

radiowaves (AM).

amplitude of a wave

the maximum distance a wave extends beyond its mid-line position.

wavelength of a wave

the distance between 2 consecutive waves (m).

Angle of incidence

the angle at which an incoming ray strikes a surface.

Angle of reflection

the angle at which a reflected ray leaves a surface.