9th Science NCERT Chapter 11
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– Production of Sound: Students should study how sound is produced through vibrating objects and how it is transmitted through a medium to be received by the ears.
– Propagation of Sound: Students should learn about how sound moves through a medium from the point of generation to the listener, understanding the concepts of compressions, rarefactions, and longitudinal waves.
– Characteristics of a Sound Wave: Students should focus on the characteristics of a sound wave such as frequency, amplitude, speed, loudness, intensity, and the audible range of hearing for humans【4:0†source】【4:1†source】【4:2†source】.
What wave property determines loudness and pitch?
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Guess which sound has a higher pitch: guitar or car horn?
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What are the typical wavelengths of sound waves in air corresponding to frequencies of 20 Hz and 20 kHz, with the speed of sound in air as 344 m/s?
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How are defects in a metal block detected using ultrasound?
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Explain how ultrasound is used for cleaning.
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