Waves

Waves

1. radio waves, microwaves, infra-red and visible light are used for communication.

2. Waves are reflected, and this is how an image in a mirror is formed.

3. waves transfer energy and can be reflected, refracted and diffracted. their speed is calculated using wavelength x frequency.

4. sound waves are longitudinal waves. the loudness and pitch of a note depends on the waves amplitude and frequency

5. electromagnetic waves are transverse waves that travel at the speed of light in a vacuum and form a continuous spectrum

6. The big bang theory states that the universe began as a very small dense and hot point and expanded rapidly. the red shift is evidence the universe has continued expanding since then.