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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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 9 years and a teacher from the past 16 years. He teaches Spoken English, Written English, Grammar and Vocabulary at Englishtan.