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प्रश्न
Which property of sound leads of the formation of echoes ?
उत्तर
Echoes are formed due to reflection of sound waves.
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संबंधित 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?
The minimum distance between the source and the reflector in air. So that an echo is heard is approximately equal to ______.
Name the device which is used to address a small gathering of people.
What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ?
State the laws of reflection of sound.
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.
Answer the following question in your own words.
What is an echo?
______ 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
