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प्रश्न
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
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उत्तर
Echoes are caused by the reflection of sound.
संबंधित प्रश्न
An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s−1?
Does sound follow the same laws of reflection as light does? Explain.
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
What is meant by an echo?
The minimum distance between the source and the reflector in air. So that an echo is heard is approximately equal to ______.
Explain why, the flash of lightning reaches us first and the sound of thunder is heard a little later.
Which property of sound leads of the formation of echoes ?
Name three devices which work on the reflection of sound.
Name the device which is used to address a small gathering of people.
Why do we hear more clearly in a room with curtains than in a room without curtains ?
Name any two objects which are good reflectors of sound.
An echo-sounder in a trawler (fishing boat) receives an echo from a shoal of fish 0.4 s after it was sent. If the speed of sound in water is 1500 m/s, how deep is the shoal ?
Explain by giving a scientific reason.
We cannot hear the echo produced in a classroom.
State two conditions necessary for hearing an echo.
What are the medical applications of echo?
How can you calculate the speed of sound using echo?
To hear an echo, the minimum distance of the obstacle from the source of sound must be ______.
______ allows bats to navigate through dark caves and find insects for food.
______ is an image obtained by the use of reflected ultrasonic waves.
