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Question

# Fill in the following blanks with suitable words : (a) Sound is caused by ______. (b) A sound wave consists of places of higher pressure called ______ and places of ______ pressure called ______ . (c) Wave speed in metres per second equals frequency in ______ multiplied by ______ in ______ . (d) Sound cannot travel through ______ . (e) The speed of sound in a solid is ______ than the speed of sound in air. (f) When the frequency of the sound is increased, the wavelength ______ .

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Solution

## (a) Sound is caused by __vibrattion____. (b) A sound wave consists of places of higher pressure called ___compression___ and places of ___lower___ pressure called __rarefraction____ . (c) Wave speed in metres per second equals frequency in __hertz____ multiplied by __wavelength____ in ___metre___ . (d) Sound cannot travel through ___vacuum___ . (e) The speed of sound in a solid is ___greater___ than the speed of sound in air. (f) When the frequency of the sound is increased, the wavelength ___decreased___ .

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