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प्रश्न
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?
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उत्तर
An echo is heard when the time interval between the original and reflected sounds is at least 0.1 s. The speed of sound in a medium increases with an increase in temperature. Hence, the time interval between the original sound and the reflected sound will decrease on a hotter day. Therefore, an echo can be heard only if the time interval between the original sound and the reflected sound is greater than 0.1 s.
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संबंधित प्रश्न
Which property of sound leads of the formation of echoes ?
Fill in the blank with suitable word :
An echo is simply a ................... sound.
State the laws of reflection of sound.
What is an echo ? How is echo formed ?
Explain by giving a scientific reason.
We cannot hear the echo produced in a classroom.
A man is standing between two vertical walls 680 m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 seconds respectively. What is the speed of sound in the air?
When sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound remain the same. Do you hear an echo sound on a hotter day? Justify your answer.
______ allows bats to navigate through dark caves and find insects for food.
______ is an image obtained by the use of reflected ultrasonic waves.
Numerical problems:
An echo returned in 3s. What is the distance of the reflecting surface from the source given that the speed of sound is 330 ms-1?
