Question 16 (1 point) A normal healthy person, who hasn't attended too many rock concerts, can detect pitches from: A) 20 Hz to 20 kHz B) 10 Hz to 10 kHz C) 100 Hz to 10 000 Hz D) 30 Hz to 30 kHz Question 17 (1 point) Sounds above the sonic frequency range of humans are known as and below the sonic frequency range the sound are called
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So, the correct answer is A) 20 Hz to 20 kHz. Show more…
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14. Match the following: - Ultrasonics: Frequency below 20Hz - Speed of sound in air: Needs material medium - Infrasonics: 330 m/s - Sound propagation: Frequency more than 20,000 Hz 15. Give an example to show that light travels faster than sound. 16. Give two differences between music and noise. 17. Mention a few measures to be taken to reduce the effect of noise pollution. 18. What steps should be taken to reduce the effect of noise pollution? 19. Describe an experiment to show that sound cannot travel through a vacuum.
Adi S.
On which of the following is pitch most dependent? a) frequency b) loudness c) all of the above d) intensity e) amplitude
A train is moving on a straight track with speed $20 \mathrm{~ms}^{-1}$. It is blowing its whistle at the frequency of $1000 \mathrm{~Hz}$. The percentage change in the frequency heard by a person standing near the track as the train passes him is (speed of sound $=320 \mathrm{~ms}^{-1}$ ) close to (A) $12 \%$ (B) $18 \%$ (C) $24 \%$ (D) $6 \%$
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