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Question
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
Solution
Echoes are caused by the reflection of sound.
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RELATED QUESTIONS
Does sound follow the same laws of reflection as light does? Explain.
On which day, a hot day or a cold day, an echo is heard sooner ? Give reason for your answer.
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
The speed of sound in water is 1500 metres per second. How far away from an under-sea rock should a deep sea diver be so that he can hear his own echo ?
What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ?
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
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Which of the following device does not work on the multiple reflections of sound waves ?
Answer the following question in your own words.
What is an echo?
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
