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प्रश्न
Write the approximate value of the speed of sound in air.
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उत्तर
The speed of sound in air = 340 ms−1
संबंधित प्रश्न
Define frequency term in relation to a wave.
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which changes.
What is the condition necessary for an echo to be heard distinctly?
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey
A type of electromagnetic wave has a wavelength of 50 Å. Name the wave and state one use of this type of wave.
Explain reflection at the boundary of a rarer medium.
A sound wave whose frequency is 5000 Hz travels in air and then hits the water surface. The ratio of its wavelengths in water and air is ______.
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 |
