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प्रश्न
What are infrasonic waves?
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उत्तर
The waves of frequency below 20 Hz are called infrasonic waves.
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.
Name the characteristic of sound in relation to its waveform.
The displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.
Study the two sound waves and compare their:
- Amplitudes
- Wavelengths
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which does not change.
State two differences between the light and sound waves.
Write the approximate value of the speed of sound in iron.
Waves produced on the surface of the water are formed to move with a velocity of 24 ms−1. If the wavelength of these waves equals 20 cm. find the
(i) frequency (no. of waves produced per second)
(ii) the time period (i.e. the time required to produce one wave) for these waves.
A sound wavelength of 0.332 m has a time period of 10−3 s. If the time period is decreased to 10−4 s, calculate the wavelength and frequency of the new wave.
Explain reflection at the boundary of a rarer medium.
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 |
