1. Class 9
  2. Chapter 12 Class 9 - Sound
  3. Questions from inside the book

Question 2 Page 170

Last updated at June 26, 2019 by

What is the range of frequencies associated with

(a) Infra-sound?

(b) Ultrasound?

 

Answer 

(a) Infra-sounds have frequencies less than 20 Hz.

(b) Ultrasounds have frequencies more than 20,000 Hz.

  1. Class 9
  2. Chapter 12 Class 9 - Sound

    3. Questions from inside the book

    Examples from NCERT Book →
Class 9
Chapter 12 Class 9 - Sound

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.