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In figure A, B, C and D represent the test tubes each of height 20 cm which are filled with water up to heights of 12 cm, 14 cm, 16 cm and 18 cm respectively. If a vibrating tuning fork is placed over the mouth of test tube D, a loud sound is heard.(a) Describe the observations with the tubes A, B and C when the vibrating tuning fork is placed over the mouth of these tubes.(b) Give the reason for your observation in each tube.(c) State the principle illustrated by the above experiment.
In figure A, B, C and D represent the test tubes each of height 20 cm which are filled with water up to heights of 12 cm, 14 cm, 16 cm and 18 cm respectively. If a vibrating tuning fork is placed over the mouth of test tube D, a loud sound is heard.
(a) Describe the observations with the tubes A, B and C when the vibrating tuning fork is placed over the mouth of these tubes.
(b) Give the reason for your observation in each tube.
(c) State the principle illustrated by the above experiment.
Class 10 | ICSE | Physics | Selina | Sound
In figure A, B, C and D represent the test tubes each of height 20 cm which are filled with water up to heights of 12 cm, 14 cm, 16 cm and 18 cm respectively. If a vibrating tuning fork is placed over the mouth of test tube D, a loud sound is heard.
(a) Describe the observations with the tubes A, B and C when the vibrating tuning fork is placed over the mouth of these tubes.
(b) Give the reason for your observation in each tube.
(c) State the principle illustrated by the above experiment.

(a) The tubes A and C produce no loud sound, while the tube B produces a loud sound.

(b) The frequency of the air column in tube D is the same as the tuning fork’s frequency. Tube B has a resonance with the air column, but tubes A and C have no resonance with the air column. Because the length of the air column in tube D is 20 – 18 = 2 cm and that in tube B is 20 – 14 = 6 cm, the frequency of vibrations of the air column in tube B is the same as the frequency of vibrations of the air column in tube D. However, the frequency of air column vibrations in tubes A and C is not equal to the frequency of air column vibrations in tube B.

(c)When the frequency of air column vibrations equals the frequency of the vibrating tuning fork, resonance occurs.

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