Electricity and Waves
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| Define electromagnetic induction: | The creation of a VOLTAGE (and maybe a current) in a wire which is experiencing a CHANGE IN MAGNETIC FIELD.
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| How can a voltage be induced in a conductor? | By moving a magnet in or near coil of wire.
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| 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
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| Define amplitude: | The distance from rest to crest and rest to trough
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| Define wavelength: | The distance between crest to crest
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| Define frequency: | Number of complete waves passing a certain point per second
Number of complete waves produced by a source each second
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| What is frequency measured in? | Hertz(Hz)
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| What does 1Hz equal? | 1 wave per second
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| Are most waves transverse or longitudinal? | Transverse
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| Give an example of a transverse wave: | Light
Any electromagnetic waves
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| 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
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| What does S=F*W stand for? | Speed = Frequency * Wavelength
(m/s) (Hz) (m)
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| What i the direction of vibrations in longitudinal waves? | Perpendicular to direction of energy transfer of the wave.
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| Give an example of a longitudinal wave: | Sound waves
Ultrasound
Shock waves (e.g. seismic waves)
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| What is the law of reflection? | Angle of incidence = angle of reflection
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| What is the imaginary line that is perpendicular to the surface at the point of incidence? | The normal
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| 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
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| When a light wave goes from less dense to dense it will... | Slow down
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| 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
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| 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
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| True of false? When light slows down if refracts towards the normal | False
When light slows down it refracts away from the normal
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