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Determined by sound source pulse duration is determined by multiplying the number of cycles in the pulse and the period of each cycle. Sound a disturbance which propagates through an elastic material at a speed which is characteristic of that material. Sound ncert solutions class 8 science ncert solutions for class 8 science chapter free pdf download no. While it does not require a background in physics to understand, it is assumed that the reader has at least high school level linear algebra, calculus, and trigonometry. Physics of sound in the sea is the distillate of the brightest, most creative minds in the underwater acoustics community during world war ii. Sound is usually caused by radiation from a solid vibrating surface or fluid disturbances.
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Near field the near field of a source is the region close to a source where the sound pressure and acoustic particle velocity are not in phase. Regions of above normal pressure regions under compression are called compressions or condensations. Cbse class 9 physics revision worksheet set e practice. A wave is a repeating disturbance that transfers energy through matter or space. These particles bump into particles close to them, transferring energy possessed. Lakhmir singh solutions for class 9 physics free pdfs.
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