Tag: world of sounds

Questions Related to world of sounds

Consider the following
l. Waves created on the surfaces of a water pond by a vibrating source.
ll. Wave created by an oscillating electric field in air.
lll. Sound waves travelling under water. 
Which of these can be polarized

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. l and ll

  2. ll only

  3. ll and lll

  4. l, ll, and lll

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Correct Option: A
Explanation:

Sound waves are longitude and can not be polarized. Answer A

The echo will be heard if the original sound reflected by an obstacle reaches our ears after a minimum time of :

physics world of sounds conditions for hearing echo echo ultrasound and its applications

  1. $10\;s$

  2. $5\;s$

  3. $1\;s$

  4. $0.1\;s$

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Correct Option: D
Explanation:

The persistence of audibility is 0.1 s