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NCERT BANGLISH-SOUND-Let us Improve our learning (Multiple choice questions)
- When can you say that the sound is propagating through a medium ?
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- The unit for the number of waves produced in a second are
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- The sounds of frequency less than 20 Hz are known as
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- The sound limit between the frequency of 20Hz – 20000Hz is called as
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- The characteristic feature of sound which conveys the sensation of sou...
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