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प्रश्न
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उत्तर
Conditions necessary for echo formation are:
1. The minimum distance between the source of sound and its reflector should be 17 m.
2. Reflected sound should reach the person atleast 0.1 second after the original sound is heard.
संबंधित प्रश्न
A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.
1) Calculate the speed with which this sound travels
2) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m?
What is the shape of a soundboard kept behind the speaker on the stage of a big hall ?
Write the approximate value of the speed of sound in iron.
Mention two properties of a wave, one property which varies and the other which remains constant when the wave passes from one medium to another.
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
What do you understand by the ‘Echolocation system of Dolphins’?
What are fishing boats?
Match the following:
| 1. | Stethoscope | a. | Repeated reflections |
| 2. | Echogram | b. | Multiple reflections |
| 3. | SONAR | c. | Ultrasonic waves |
| 4. | Reverberation | d. | Speed of underwater objects |
