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प्रश्न
A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap is opened and the water level gradually falls. It is observed that the sound becomes the loudest for a particular length of the air column. What is the name of the phenomenon taking place when this happens? Why does the sound become the loudest?
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उत्तर
Resonance in the air column. The frequency of vibrating tuning fork becomes equal to the frequency of vibrating air column. As a result, the amplitude of the sound produced increases. Since loudness is proportional to the square of the amplitude, so the sound is loudest.
संबंधित प्रश्न
What are mechanical waves?
Distinguish between the free (or natural) and forced vibrations.
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?
In fig. , P, Q, R and S represent test tubes each of height 20 cm which are filled with water upto heights of 10 cm, 14 cm, 16 cm and 18 cm respectively. If a vibrating tuning fork is placed over the mouth of test tube Q, a loud sound is heard.
(i) Describe the observations with the tubes P, R and S.
(ii) Give the reason for your observation in each case.
(iii) State the principle illustrated by the above experiment.
Explain why are soldiers asked to walk out of step while crossing bridges?
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.
