Waves Flashcards
1
Q
What is a progressive wave?
A
- A moving wave,
- that transfers energy from one point to another,
- without transferring any matter.
2
Q
Define displacement
A
- Distance (and direction) a point on a wave has moved,
- from its equilibrium position.
3
Q
Define amplitude
A
- Maximum magnitude of displacement of a point on a wave,
- from its equilibrium position.
4
Q
Define wavelength
A
- Distance between two adjacent points,
- moving in phase with each other.
5
Q
Define period
A
- Time taken for one wave cycle to complete/ pass a point.
6
Q
Define frequency
A
- Number of wave cycles,
- produced per second / passing a point per second.
7
Q
Define phase difference and give 3 ways of measuring it
A
- Amount one wave (or one point on a wave) lags behind another.
- Measured in fractions of a cycle, degrees (o) or radians (rad).
- One cycle = 360o = 2π rad.
8
Q
Define ‘in phase’ and ‘in anti-phase’ in terms of phase difference.
A
- In phase
– phase difference = 0 degrees or 0 rad - In anti-phase
– phase difference = 180 degrees or π rad or ½ cycle.
9
Q
A
