- vibrations go up and down
- most waves are transverse
Eg. All electronic waves, S waves, ripples and waves in water
•the vibrations are parallel to the direction the wave travels
Examples include sound waves and p waves
equation for wave speed
how to measure the speed of sound
how to find speed of waves in solids
Waves changing direction at a boundary
definition of absorbed
If the wave is absorbed the wave transfers energy to the material’s energy stores
Often transferred to a thermal store which leads to heating (how microwaves work)
definition of transmitted
If a wave is transmitted the waves carries on travelling through the material.
This often leads to refraction
definition of reflected
If a wave is reflected this means the ray is neither absorbed or transmitted but instead ‘sent back’
This is how echoes are created
what causes sound waves?
Caused by vibrating objects
what type of wave are sound sound waves?
how does sound travel in a gas?
how does sound travel in a solid?
how does sound travel in a liquid?
what are echoes?
explain how humans hear sound
explain how ultrasound works
what are ultrasounds used for?
Sound with frequencies lower than 20Hz
definition of seismic waves
- earthquakes and explosions cause seismic waves
- can be detected with a seismometer
- two main types p waves and S waves
- travel through solids and liquids
- travel faster than S waves
- only travel through liquids
- slower than p waves
definition of refraction
what happens when the light refracts off a smooth surface?
what happens when the light refracts off a rough surface?
how to investigate fraction
definition of converging/convex lens
definition of diverging/concave lens
how does light travel through a convex lens?
how does light travel through a concave lens?
how can you increase the power of the lenses?
definition of virtual image
definition of real image
list the electromagnetic spectrum
- radio waves
- infrared radiation
- visible light
- ultra violet
- Gamma rays
which has the longest wavelength in the electromagnetic spectrum?
which has the lowest frequency in the electromagnetic spectrum?
how can EM be used for communication ?
uses and features of each in the EM spectrum
which has the shortest wavelength in the electromagnetic spectrum?
which has the highest frequency in the electromagnetic spectrum?