Advertisements
Advertisements
Question
In following figure shows A, B , C and D represent test tube each of height 20 cm which are filled with water up to heights of 12 cm, 14 cm, 16cm and 18cm respectively. If a vibrating tuning fork is placed over the mouth if test tube D, a loud sound is heard.
- Describe the observations with the tubes A, B and C when the vibrating tuning fork is placed over the mouth of these tubes.
- Give the reason for your observation in each case.
- State the principle illustrated by the above experiment.
Advertisements
Solution
- No loud sound is heard with the tubes A and C, but a loud sound is heard with the tube B.
- While tubes A and C do not experience resonance with their air columns, tube B does. The air column length in tube D is 20 – 18 = 2 cm, while in tube B it is 20 – 14 = 6 cm, which is three times the length in tube D. Consequently, the frequency of vibrations in both tubes is identical. Contrarily, air column vibrations in tubes A and C do not have the same frequency as those in tube B.
- Resonance happens when the air column vibration frequency is exactly the same as the tuning fork vibration frequency.
APPEARS IN
RELATED QUESTIONS
Define the Resonance phenomenon?
Give one example to illustrate forced vibrations.
Describe a simple experiment to illustrate the phenomenon of resonance and explain it.
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.
Name the phenomenon involved in tuning your radio set to a particular station and define it.
(i) Define resonant vibrations.
(ii) Which characteristic of sound, makes it possible to recognize a person by his voice without seeing him?
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.
Differentiate between the following:
Light and sound waves.
