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प्रश्न
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.
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उत्तर
- 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.
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संबंधित प्रश्न
In the diagram below, A, B, C, D are four pendulums suspended from the same elastic string PQ. The length of A and C are equal to each other while the length of pendulum B is smaller than that of D. Pendulum A is set into a mode of vibrations
1) Name the type of vibrations taking place in pendulums B and D?
2) What is the state of pendulum C?
3) State the reason for the type of vibrations in pendulum B and C.
Give one example to illustrate forced vibrations.
Describe a simple experiment to illustrate the phenomenon of resonance and explain it.
Two pendulums C and D are suspended from a wire as shown in the figure give below. Pendulum C is made to oscullate by displaying it from its mean position. It is seen that D also starts oscillating.
(i) Name the type of oscillation, C will execute.
(ii) Name the type of oscillation, D will execute.
(iii) If the length of D is made equal to C then what difference will you notice in the oscillations of D ?
(iv) What is the name of the phenomenon when the length of D is made equal to C ?
A bucket kept under a running tap is getting filled with water. A person sitting at a distance is able to get an idea when the bucket is about to be filled.
(i) What change takes place in the sound to give this idea?
(ii) What causes the change in the sound?
Explain why are soldiers asked to walk out of step while crossing bridges?
Explain why does the rear mirror of a motorbike start Vibrating Violently, at some particular speed of motorbike?
What do you understand by free vibrations of a body? Draw a displacement-time graph to represent them. Given one example.
Describe a simple experiment to illustrate the phenomenon of resonance and explain it.
