EMW

Radio waves - frequency

500 kHz to about 1000 MHz

Radio waves - wavelength

> 0.1 m

Radio waves - use

Radio and television communication systems. Cellular phones

Microwave - frequency

gigahertz (GHz)

Microwave - wavelength

1 mm to 0.1 m

Microwave - uses

Radar systems used in aircraft navigation.

Microwave ovens

Speed guns used to time fast balls, tennis serves, and automobiles

Infra-red - frequency

Infra-red - wavelength

Infra-red

Heat waves

Maintaining the earth’s warmth

Electronic devices

Earth satellites

Light - frequency

4 × 10¹⁴ Hz to about 7 × 10¹⁴ Hz

Light - wavelength

700 – 400 nm

Light

Ultraviolet - frequency

4 × 10^–7 m down to 6 × 10^–10m

Ultraviolet - wavelength

400 nm to 0.6 nm

Ultraviolet

Harmful effects on humans

Welding arcs

LASIK surgery

UV lamps are used to kill germs in water purifiers.

X-rays - frequency

10^–8 m down to 10^–13 m

X-rays - wavelength

(10 nm) to (10^–4 nm)

X-rays

Gamma rays - frequency

Gamma rays - wavelength

Gamma rays