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Sound is a form of energy.
It is that form of energy that makes us hear. |
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| A Wave is a vibratory disturbance in a medium which carries energy from one point to another without there being a direct contact between the two points. |
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| What is a longitudinal wave? |
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| A wave in which the particles of the medium vibrate back and forth in the same direction in which the wave is moving, is called a longitudinal wave. |
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| A compression is that part of a longitudinal wave in which the particles of the medium are closer to one another that they normally are , and there is a momentary reduction in volume of the medium. |
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| A rarefaction is that part of a longitudinal wave in which the particles of the medium are farther apart than normal, and there is a momentary increase in the volume of the medium. |
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| The elevation or a hump in a transverse wave is called a crest. |
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| The depression or hollow in a transverse wave is called a trough. |
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| The minimum distance in which a sound wave repeats itself is caleed its wavelength. |
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| The maximum displacement of the particles of the medium from their original undistyrbed positions, when a wave passes through the medium. |
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| The time required to produce one complete wave(or cycle) is called time-period of the wave. |
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The number of complete waves (or cycles) produced in o0ne second is called frequency of the wave.
SI UNIT-Hertz(Hz) |
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| The distance travelled by a wave in one second is called velocitu of the wave (or speed of the wave). |
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Velocity=Frequency * Wavelength
=f * λ |
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| Sound is produced when an object vibrates (moves back and forth rapidly). |
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