Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • NCERT
  • Earthquake produces which kind of sound before the main shock wave begins (a) ultrasound (b) infrasound (c) audible sound (d) none of the above

Earthquake produces which kind of sound before the main shock wave begins

(a) ultrasound

(b) infrasound

(c) audible sound

(d) none of the above

Answers (1)

Answer: B

Solution:

Earthquake produces Seismic waves before the main shock wave.

The Seismic waves have frequency less than 10 Hz.

This frequency is less than audible range and it is called infra sound or infrasonic wave.

The sound of frequency more than that of audible range is called ultrasound or ultrasonic waves.

Sound of frequency less than 20 Hz is called infrasonic and a frequency more than 20,000 Hz is called ultrasonic.

The correct answer of this question is option B

Posted by

infoexpert24

View full answer

Similar Questions

Latest Question