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# GCSE SCIENCE PHYSICS

### Electricity and Waves

Define electromagnetic induction: The creation of a VOLTAGE (and maybe a current) in a wire which is experiencing a CHANGE IN MAGNETIC FIELD.
How can a voltage be induced in a conductor? By moving a magnet in or near coil of wire.
What are the four factors that affect the size of the induced voltage and current? The strength of the magnet The area of the coil The number of turns on the coil The speed of the movement
Define amplitude: The distance from rest to crest and rest to trough
Define wavelength: The distance between crest to crest
Define frequency: Number of complete waves passing a certain point per second Number of complete waves produced by a source each second
What is frequency measured in? Hertz(Hz)
What does 1Hz equal? 1 wave per second
Are most waves transverse or longitudinal? Transverse
Give an example of a transverse wave: Light Any electromagnetic waves
True or false? In transverse waves the vibrations are parallel to the direction of energy transfer of the wave? False The waves are perpendicular to the direction of energy transfer of the waves
What does S=F*W stand for? Speed = Frequency * Wavelength (m/s) (Hz) (m)
What i the direction of vibrations in longitudinal waves? Perpendicular to direction of energy transfer of the wave.
Give an example of a longitudinal wave: Sound waves Ultrasound Shock waves (e.g. seismic waves)
What is the law of reflection? Angle of incidence = angle of reflection
What is the imaginary line that is perpendicular to the surface at the point of incidence? The normal
State how much diffraction occurs for each of the following: 1) Gap is much wider than the wavelength 2) Gap is the same as the wavelength 3) Gap is a bit wider than the wavelength 1)Little diffraction 2)Maximum diffraction 3)Diffraction only at the edges
When a light wave goes from less dense to dense it will... Slow down
When light goes through a boundary (less dense to dense) what changes and what stays the same? The frequency stays the same The wavelength shortens
If a wave hits a boundary (less dense to dense) at an angle it will slow down and change direction. What does the change in direction show? Refraction
True of false? When light slows down if refracts towards the normal False When light slows down it refracts away from the normal
Created by: briannafowlie