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प्रश्न
Fill in the blank with suitable word :
An echo is simply a ................... sound.
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उत्तर
An echo is simply a reflected sound.
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संबंधित प्रश्न
What is meant by an echo?
On which day, a hot day or a cold day, an echo is heard sooner ? Give reason for your answer.
Why do we hear more clearly in a room with curtains than in a room without curtains ?
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 ?
Explain by giving a scientific reason.
We cannot hear the echo produced in a classroom.
What is the minimum distance needed for an echo?
State two conditions necessary for hearing an echo.
______ allows bats to navigate through dark caves and find insects for food.
______ is an image obtained by the use of reflected ultrasonic waves.
Rohan conducted experiments on echo in different media. He observed that a minimum distance of 'x' meters is required for the echo to be heard in oxygen and 'y' meters in benzene. Compare 'x' and 'y'. Justify your answer.
Speed of sound in oxygen: 340 ms-1
Speed of sound in benzene: 200 ms-1
