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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?
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उत्तर
1) For first sound, f = 256 Hz and λ = 1.3 m
We know that
Speed v = f x λ = 256 x 1.3
→ v = 332.8 m s-1
Thus, the sound travels with a speed of 332.8 m s-1
2) For the second case, λ = 2.6 m and v = 332.8 m s-1
Frequency, f = `v/lambda = 332.8/2.6`
→ f = 128 Hz
The frequency of the first sound is more that of the second sound.
∴ The first sound will be shriller than the second sound
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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 ms1 for all frequencies; calculate the wavelengths corresponding to the given extreme frequencies of the audible range
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:
1) Amplitudes
2) Wavelengths
State the use of echo by a bat, dolphin and fisherman.
What is a bulb horn ? Name the principle on which a bulb horn works.
What do you mean by reflection of sound? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.
Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?
(i) A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 ms−1?
(ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?
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 |
