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प्रश्न
State three conditions for the formation of an echo.
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उत्तर
- The minimum distance between the source of sound and its reflector should be 17 m.
- Reflected sound should reach the person atleast 0.1 second after the original sound is heard.
- The size of the reflecting surface must be much larger than the wavelength of the sound wave to ensure strong reflection.
- The original sound must be loud enough so that the reflected wave still has enough energy to be clearly heard by the ear.
Notes
Students should refer to the answer according to their questions.
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संबंधित प्रश्न
The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 m s−1 for all frequencies, calculate the wavelengths corresponding to the given extreme frequencies of the audible range.
What is the condition necessary for an echo to be heard distinctly?
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
Write the approximate value of the speed of sound in water.
Write the approximate value of the speed of sound in iron.
A cork piece is floating on the surface of the water in a pond. A piece of pebble is dropped into the water. What will be your observation?
What is meant by an echo? Explain.
