Physics Formulas for the chapter-Sound
Apr 26, 2022, 16:45 IST
Chapter-Sound of class 8 Science
Sound is a mechanical wave that results from the back-and-forth vibration of the particles of the medium.
- Compression: The region of maximum density of medium in a longitudinal wave.
- Rarefaction: The region of minimum density of medium in a longitudinal wave.
- Amplitude: The maximum displacement of vibrating particles from Its mean position
- Wavelength: The wavelength is the horizontal length of one cycle of the wave.
- Time period: Time taken by a vibrating particle to make one complete vibration
- Frequency: The number of vibrations completed by a particle in one second
- Pitch: The sensation (brain interpretation) of the frequency of ani emitted sound.
- Intensity: Sound energy transferred per unit time per unit area, placed perpendicular to the direction of the propagation of sound.
- Echo: The sound heard after reflection from a rigid obstacle. It is of three types:
- Instantaneous echo
- Syllabic echo
- Audible waves: Frequency 20Hz to 20kHz.
- Infrasonic waves: below 20 Hz.
- Ultrasonic waves: Above 20KHz.
- Noise: Sound waves which produces some trouble sensation and are unacceptable.
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