Chapter Two : Sound

موضوع: Chapter Two : Sound السبت يناير 12, 2008 1:39 am

Certificate - Two Terms - Chapter Two : Sound

1- Laws of reflection of sound:
Fisrt law: angle of incidence = angle of reflection
- Second law: The incident sound ray, the reflected sound ray and the normal to the reflecting surface at the point of incidence, all lie in one plane to the reflecting surface.
2- Law of refraction of sound: - Sound changes its direction (refracts) when traveling from one medium to another due to variations in the velocity of sound in the two media that:
3- Interference of sound:
- Constructive interference:
(maximum intensity) of equal frequency and amplitude sound waves)
- Path difference = m l
Distructive interference:
(zero intensity interference):

4- Sound diffracts when obstructed by on obstacle or upon passage through an aperture of dimensions comparable to tis wave length.
5- Standing waves:
- Node: is a position of zero vibration amplitude.
- Antinode: is a position of maximum vibration amplitude..
- The waves length: of a standing wave.
It is double the distance between two successive nodes or two successive antinodes.
5- Vibration of strings:

- The ratio between tones produced by a string is : 1: 2: 3: ……..
- The parameter affecting the
fundamental tone are:

موضوع: رد: Chapter Two : Sound السبت سبتمبر 17, 2011 2:23 pm

thanks alot

thanksssssssssssssssss

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