Physics: P2 - waves, electromagnetic spectrum

name the 2 types of waves

transvers, longitudinal

how to calculate wave speed

wave speed = frequency x wave length

how do the oscillations travel in a longitudinal wave

parallel to the direction of energy transfer

how do the oscillations travel in a transverse wave

perpendicular to the direction of energy transfer

give 2 examples of transverse waves

light, and water

give 2 examples of longitudinal waves

sound, seismic waves

what is a seismic wave

a wave produced by an explosion or earth quake that travelled through the earth

how to calculate wave length

wavelength = speed/frequency

how to calculate frequency

frequency = speed/wavelength

what is the order of waves n the electromagnetic spectrum

radio waves, microwaves, infa-red, visible light, UV, x-rays and gamma rays

give 2 uses of radio waves

Tv and military communications

give 2 uses of micro waves

cooking food and satellite communications

give 2 uses of infa-red

heal sport injuries and Tv remotes

give 2 uses of visible light

photography and vision

give 2 uses of UV

to get a sun tan and detecting forged bank notes

give 2 uses of x-rays

to see inside the boy and detect broken bones

give 2 uses of gamma waves

kills cancer cells and sterilise medical equipment

give a danger of micro waves

internal burns

give a danger of infa-red

cause you to dangerously over heat

give a danger of visible light

too much light can damage your retina

give a danger of UV

external burns

give a danger of x-rays

too many can cause severe cell damage

give a danger of gamma waves

can cause cancer

what is refraction

when the light refracts (changes direction) due to the density changing e.g. going through a glass block

what is reflection

when the light reflects (bounces off ) and object e.g. a mirror