# Physics-Waves and SHM.txt

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1. Define amplitude
The maximum displacement of the system from equilibrium/from centre of motion .
2. Describe what is meant by damping.
The amplitude of the oscillations/(total) energy decreases (with time); because a force always opposes direction of motion/there is a resistive force/there is a friction force.
3. Define light ray
Direction by which the energy of the light wave travels.
4. Define wavefront.
Line connecting points with same phase/displacement;
5. Explain what is meant by resonance.
Resonance is where driving frequency equals/close to natural frequency; the frequency at the maximum amplitude of the graph;
6. State the condition necessary for an object to execute SHM.
The net force acting is proportional to the displacement/distance (of the particle) from its equilibrium position; is directed towards the equilibrium position;
7. Describe what is meant by a transverse wave.
The energy of the wave is propagated in a direction at right angles; to the direction of oscillation of the particles;
8. State what is meant by a longitudinal wave.
Transfer of energy by means of vibrations/oscillations; vibrations all in one direction parallel to direction of energy transfer;
9. State what is meant by natural frequency.
The frequency at which a system oscillates when not subjected to a continuous or repeated external force.
10. State what is meant by a forced oscillation.
Oscillation under the action of an external periodic force.
11. State what is meant by a progressive wave.
Transfer of energy between two points; without a transfer of the medium.
12. Define intensity of a wave.
It is the power transferred by the wave per unit area. Brightness of light, or loudness of sound. I is proportional to A^2
13. State the principle of superposition.
The resulting wave of two individual waves meeting at a point is the vector sum of the amplitudes of the individual waves.
14. Describe constructive interference.
Waves meet at a point and interfere. Through superposition the amplitudes of the individual waves add together to result in an amplitude which is larger than the individual waves.
15. Describe destructive interference.
Waves meet at a point and interfere. Through superposition the amplitudes of the individual waves add together to result in an amplitude which is smaller than the individual waves.
16. Define crest
The maximum positive displacement (amplitude) of a wave.
17. Define trough
The maximum negative displacement (amplitude) of a wave.
18. Describe a wave compression
Occurs in longitudinal waves. The position in the wave where the medium moves the closest together. The position in the wave where pressure is the highest.
19. Describe wave compression
Occurs in longitudinal waves. The position in the wave where the medium moves the furthest apart. The position in the wave where pressure is the lowest.
 Author: richardive ID: 217787 Card Set: Physics-Waves and SHM.txt Updated: 2013-05-05 07:51:50 Tags: Physics IB Folders: Description: lwigowjgad Show Answers: