Question

Write any two condition required for echo

Answer 1

Answer:

• there should be a cliff or an obstacle present
• the minimum distance between the speaker and the obstacle should be 17m

Answer 2

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$\fbox{\star} \: \mathtt{ \underline{ \: \: What \: is \: echo \: ?? \: \: }} \: \fbox{\star}$

The repeated hearing of a sound after reflection from an obstacle is called an echo

The condition for the production of an echo are as follows :

• Sufficient distance between the source of sound and obstacle . this distance should be at least 17.2 m

• Sufficient time gap between original and reflected sound . this should be at least 0.1 sec

• The size of obstacle should be quite large

• The reflecting surface of a obstacle should be regid

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