Waves Flashcards
In transverse waves what are the vibrations to the direction of Energy transfer
Perpendicular
What are examples of transverse waves
Light all the other EM waves
Ripples on water
Waves on a string
What are examples of longitudinal waves
Sons waves
ultra sound
Shock waves
In longitudinal waves the vibrations are what to the direction of energy transfer
Parallel
Wave speed=
Frequency (times) wavelength
What is the frequency
The number of complete waves passing a certain point per second or
the number of waves produced by a source each second
What can all waves be
Reflected
Refracted
Diffracted
What is the law of reflection
Angle of incidence = angle of reflection
What does refracted mean
They go through a new material but change direction
What does diffracted mean
The waves bend round obstacles causing the waves to spread out
How can light be diffracted
If there is a really small gap
How can waves only be refracted
If they meet a new median at an angle
What are radio waves mainly used for
Communication
How can waves be transmitted all over the world
Because long wavelengths diffract around curved surfaces of the earth
What are radio waves used for
TV
Fm radio
How are short wave signals reflected
Off the ionosphere
What are microwaves used for
Satellite communication
Mobile phones
Can radio waves pass through earths watery atmosphere
No
What are infared waves used for
Remote controls
Optical fibres
What is visible light used for
Photography
How does a camera work
Uses a lens to focus visible light onto a light sensitive film or electronic sensor
What does a lens aperture do
Controls how much light enter the camera
What are sound waves caused by
Vibrating objects
Can sound travel in space
No because it is mostly a vacuum
