| Question | Answer |
| 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 |
