Flashcards
Waves - 4th Form
Cards in this deck (14)
- 1Transverse Waves-Direction of vibration is at 90 degrees to the angle of travel.
-e.g. ripples, electromagnetic waves. - 2Longitudinal Waves-Direction of vibration is along the direction of travel.
-e.g. sound waves and seismic waves.
- 3Types of WavesElectromagnetic waves, water waves, sound waves, light waves,
- 4Frequency and AmplitudeFrequency - the number of waves passing a point each second (f). 1 wave per second = 1Hz
Amplitude - measure of how much energy a wave carries, It is measured as the maximum displacement from the x axis. It i measured in meters (m). - 5Wavelength and Wave SpeedWavelength - the distance between two identical peaks on a wave - i.e. the length of a wave. Measured in meters (m).
Wave Speed - the distance traveled by a wave in a certain amount of time. Formula is: wave speed = frequency * wavelength. - 6Vectors and ScalarsVectors have both direction and magnitude. Examples include all forces, displacement and velocity. Scalars have only magnitude, and include energy, mass, distance and speed.
- 7Electromagnetic WavesIn order of decreasing wavelength and increasing frequency: radio waves, microwaves, infra-red, visible light, ultra violet, x-ray, and gamma.
They all travel at 3x10^8 m/s, are a combination of electric and magnetic fields, have 0 mass, and can travel through a vacuum. - 8Radio WavesLongest wavelength, used for sonar, radios and long distance communication. Naturally occur in lightning.
- 9MicrowavesWavelength of a pencil, used for cooking food and communication. Can be dangerous.
- 10InfraredFelt as heat as it is a wavelength our skin can absorb. Used in TV remotes to transmit signals, and to see at night (i.e. see heat). Also used for heating.
- 11Visible LightCan be reflected and refracted of surfaces. Used for vision and photography.
- 12Ultra VioletVery short wavelength, used for sterilizing equipment and checking counterfeit money. Causes suntans and sunburns.
- 13X-RayUsed to scan body and check for bone damage, as our bones absorb the x-rays. Large doses can cause carcinogens and cancer.
- 14Gamma RaysShortest wavelength, most energy, produced when atoms split. They kill living cells by mutation. Can both cause and cure cancer.
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- Physics Flashcards on Waves - 4th Form, created by Kyan Jasani-Draper on 02/06/2017.
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- Kyan Jasani-Draper
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