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Study of Sound — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceStudy of Sound3 Marks
Question
Infrasound and Ultrasound
✓

Answer

Infrasound Ultrasound
(i) Longitudinal waves whose are below 20 Hz are called Infrasound waves. frequencies Infrasonic or(i) Longitudinal waves whose frequencies lie- above 20,000 Hz are called Ultrasonic or ultrasound waves.
(ii) Whales, elephants produce sound in the infrasound range.(ii) Bats produce (30 kHz to 50 kHz) frequency and dolphins produce ultrasound (100 kHz).

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