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Page No 170: - Chapter 12 - Sound - Ncert Solutions class 9 - Science
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Question 1:
What is the audible range of the average human ear?
Answer:
The audible range of an average human ear lies between 20 Hz to 20,000 Hz. Humans cannot hear sounds having frequency less than 20 Hz and greater than 20,000 Hz.
Question 2:
What is the range of frequencies associated with
(a) Infrasound?
(b) Ultrasound?
Answer:
(a) Infrasound has frequencies less than 20 Hz.
(b) Ultrasound has frequencies more than 20,000 Hz.
