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प्रश्न
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a bare room
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उत्तर
The person would hear echoes when talking in a bare room.
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संबंधित प्रश्न
What is meant by an echo?
Which of the following statement best describes frequency?
Name three devices which work on the reflection of sound.
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 ?
The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea by the echo method ?
What is the minimum distance needed for an echo?
State two conditions necessary for hearing an echo.
What are the medical applications of echo?
______ is an image obtained by the use of reflected ultrasonic waves.
Answer the following question in your own words.
What factors are important to get a distinct echo?
