Q. 63 A4.3( 12 Votes )
What is an echo? How is echo formed?
Answer :
The repetition of sound wave caused by the reflection of sound wave is called echo. For an echo to happen it requires a hard surface like a tall brick wall or clif to bounce the sound back.
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(a) What is an echo?
(b) How is an echo different from a reverberation?
(c) Describe an activity to demonstrate that sound follows the same laws of reflection as light.
Together with Science
Describe two uses of multiple reflections of sound.
Together with ScienceAditi clapped her hands near a cliff and heard the echo after 4 seconds. What is the distance of the cliff her if the speed of sound is taken as 346 ms-1.
Together with ScienceDefine reverberation.
Together with ScienceAn echo is returned in 6 seconds. What is the distance of reflecting surface from source? [given that speed of sound is 342 m/s.]
Together with ScienceWhat is a stethoscope? Name the principle on which a stethoscope works.
Lakhmir Singh & Manjit Kaur - Physics