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प्रश्न
Explain a person walking past a railway line, in the middle of night hears a ringing sound along with the sound of his footsteps.
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उत्तर
When the vibrations produced by the feet of the person are impressed on the rails, they vibrate with forced vibrations, thereby producing a loud sound.
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संबंधित प्रश्न
Define the Resonance phenomenon?
In following figure shows two tuning forks A and B of the same frequency mounted on two separate sound boxes with their open ends facing each other. The fork A is set into vibration.
- Describe your observation.
- State the principle illustrated by this experiment.
A vibrating tuning fork, held over an air column of a given length with its one end closed, produces a loud audible sound. Name the phenomenon responsible for it and explain the observation.
Why are the stringed instruments like guitar provided with a hollow sound box?
Differentiate between the following:
Light and sound waves.
The diagram below shows three different modes of vibration P, Q and R of the same string of a given length.
 |
 |
 |
| P | Q | R |
- Which vibration will produce a louder sound and why?
- Which vibration will produce sound of maximum shrillness (or pitch) and why?
- What is the ratio of wavelength of vibrations P and R?
A bucket kept under a running tap is getting filled with water. A person sitting at a distance is able to get an idea when the bucket is about to be filled.
(i) What change takes place in the sound to give this idea?
(ii) What causes the change in the sound?
