Physics For General Secondary Certificate-mr/sayed

[الاستاذ سيد طنطاوى]

Physics For General Secondary Certificate - Two Terms - Chapter One : Wave Motion
1- The wave: It is a disturbance that propagate, spreads and carries energy along
2- The displacement: Is the distance of an object at any instance from its rest (equilibrium) position.
3- The amplitude of oscillation "A"
It is the maximum displacement, OR, is the distance between two points, along the path of the oscillating object its velcoity is maximum at one of them, and is zero at the other.
4- The complete oscillation:
Is the movement of a continously of a vibrating body through the time intrval it passes by a fixed point two successive times in the same direction.
5- The period: "T"
- Is the time taken by a continously vibrating body to performone complete oscillation. OR - Is the time taken by a continously vibrating body to pass a fixed point two successive times in the same direction.
6- The frequency : "n"
- Is the Nnumber of of complete oscillations produced by a vibrating object in one second. It is also the number of waves passing by a certain point in one second.
8- Mechanical waves: - They are either
1- transverse
2- longitudinal - Transverse wave: are that in which particles of midium oscillate about their equilibrium position perpendicular to the direction of propagation.
- It consists of crests and troughs. In succession
- Its wave length is the distance between two successive crests or troughs.
* Longitudinal wave:
- Are that in which the particle of midum oscillate about their equilibrium positions along the same direction of propagation.
- It consists of compressions and rarefactions in succession .
- Its wave length is the distance between two sucessive compressions or rarefactions.
9- The wave length:
It is the distance between two successive points a long the direction of propagation of the wave where the phase is the same. (same disoplacement and same amplitude)
10- , for any wave motion.