Advertisements
Advertisements
Question
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?
Advertisements
Solution
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.
RELATED QUESTIONS
Describe a simple experiment to illustrate the phenomenon of resonance and explain it.
In following figure shows A, B, C and D are four pendulums suspended from the same elastic string XY. Lengths of pendulum A and D are equal, while the length of pendulum B is smaller and the pendulum C is longer. The pendulum A is set into vibration.
(a) what is your observation? (b) Give reason for your observation.
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.
When a body vibrates under a periodic force, the vibrations of the body are ______.
In Fig. A, B, C and D are four pendulums suspended from the same elastic string XY. The lengths of pendulum A and D are equal, while the length of pendulum B is shorter and of the pendulum C is longer. Pendulum A is set into vibrations.
- What is your observation about the vibrations of pendulum D?
- Give reason for your observation in part (a).
- What type of vibrations take place in pendulums Band C?
- Give reason for the answer in part (c).
On keeping the stem of a vibrating tuning fork on the surface of a table, a loud sound is heard. Give reason.
When the stem of vibrating tuning fork is pressed on a table, the tabletop starts vibrating. These vibrations are definitely an example of ______.
