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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
Name the phenomenon involved in tunning a radio set to a particular station
What are mechanical waves?
Distinguish between the free (or natural) and forced vibrations.
When a troop crosses a suspension bridge, the soldiers are asked to break steps. Explain the reason.
How do you tune your radio set to a particular station ? Name the phenomenon involved in doing so and define it.
In fig. shows two tuning forks P and Q of the same frequency mounted on separate sound boxes with their open ends facing each other. The fork A is set into vibration. (i) Describe your observation. (ii) State the principle illustrated by this experiment.
A string stretched between its ends is made to vibrate by placing the stem of a vibrating tuning fork at its one end. State three ways how you will increase the frequency of note produced by the string.
