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प्रश्न
What are infrasonic waves?
एका वाक्यात उत्तर
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उत्तर
The waves of frequency below 20 Hz are called infrasonic waves.
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
संबंधित प्रश्न
A wire of length 80 cm has a frequency of 256 Hz. Calculate the length of a similar wire under similar tension, which will have frequency 1024 Hz
Name the characteristic of sound in relation to its waveform
State the use of echo by a bat, dolphin and fisherman.
Distinguish between mechanical and electromagnetic waves.
Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.
What are mechanical waves?
Write the approximate value of the speed of sound in iron.
What do you understand by the ‘Echolocation system of Dolphins’?
Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?
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 |
