Same chapter3 marksDifficulty: Medium
Distinguish between a musical sound and a noise.
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3 marksDifficulty: Medium
Distinguish between infrasonic, audible and ultrasonic sound and give one use of ultrasound.
Original Khojo Papers practice question — not from a past board paper.
Answer
Infrasonic sound has a frequency below 20 Hz, audible sound lies between 20 Hz and 20,000 Hz, and ultrasonic sound is above 20,000 Hz. Ultrasound is used in medical imaging, in cleaning delicate parts and in detecting flaws in metals.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Elephants and whales communicate using infrasound.
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