Waves Flashcards
List the 7 EM Waves in the correct order
1) Radio Waves
2) Micro Waves
3) Infra-Red
4) Visible Light
5) Ultra Violet
6) X-Rays
7) Gamma Rays
Define refraction
The bending of a wave when it enters a medium where its speed is different.
What happens when a wave crosses a boundary between two substances e.g from glass to air?
It bends (changes direction)
What are sound waves caused by?
Vibrations.
What type of wave does sound travel by?
Longitudinal waves.
what units are used to measure wavelength
Meters
What do EM waves with higher frequencies have?
Shorter wavelengths
What is the use for a Radio Wave?
Radio Waves are mainly used for communication (e.g.. broadcasting)
What is Infra-Red used for?
Infra-Red is used for remote controls and for police helicopters
What is Ultra Violet used for?
Ultra Violet is used in sun beds
Name a use for X-Rays
A use that X-Rays are used for is medical scanning (e.g. looking inside a humans body)
Name a use for a Gamma Ray
Gamma rays are used for sterilising
What are Micro Waves used for?
Micro Waves are used for cooking food and also used for mobiles
What is Visible Light used for?
Visible Light is used for fibre-optic broadband
what does frequency mean?
How many waves per second
What is the equation to find the speed of a wave?
v=fxλ
What is frequency measured in?
Hertz (Hz)
What is the amplitude?
The difference from the equilibrium to the crest
Name one of the difference between the transverse and longitudinal wave?
Transverse waves are perpendicular vibrations to the direction of energy transfer
Longitudinal waves vibrations are parallel
Is this following statement true or false:
All waves can be reflected, refracted and diffracted
True
What does this following equation mean:
v=fxλ
speed=frequency x wavelength
What are the two types of waves?
Transverse and Longitudinal waves
What is speed measured in?
Miles per second (m/s)
Does Radio Waves have a long wavelength and low frequency or short wavelength and high frequency?
Radio Waves have a long wavelength and low frequency
Does Gamma Rays have a short wavelength and high frequency or a long wavelength and low frequency?
Gamma Rays have a short wavelength and high frequency
What is pitch
How high or low the sound is
What is pitch affected by
Frequency
What is the Doppler effect?
- When something emits waves moves towards you or away from you
- The frequency moves toward you and will seem higher and wavelength is shorter
- The frequency of a source moving away from you will seem lower and its wavelength will seem longer
