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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 - Physics

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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.

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उत्तर

1) The vibrations which occur in pendulums B and D are called forced vibrations.

2) Pendulum C is in the state of resonance with pendulum A as it is of the same length.

3) The pendulums vibrate because the forced vibration from A is transferred due to string PQ

Pendulum B is of a different length as compared to pendulum A. Hence, it will continuously vibrate with a frequency which is different from that of pendulum A. Its amplitude will also be very small.

Pendulum C is of the same length as compared to pendulum A. Hence, it will vibrate in phase with pendulum A. Its amplitude will be equal to that of pendulum A as it will attain resonance

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2014-2015 (March) Science Paper 1

संबंधित प्रश्न

Define the Resonance phenomenon?


How does the medium affect the amplitude of free/natural vibrations of a body?


What are forced vibrations? 


Describe a simple experiment to illustrate the phenomenon of resonance and explain it.


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.

  1. Describe the observations with the tubes A, B and C when the vibrating tuning fork is placed over the mouth of these tubes.
  2. Give the reason for your observation in each case.
  3. State the principle illustrated by the above experiment.

How do you tune your radio set to a particular station ? Name the phenomenon involved in doing so and define 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 ?


In fig. shows two tuning forks P and Q of the same frequency mounted on separate sound boxes with their open ends facing each other. The fork A is set into vibration. (i) Describe your observation. (ii) State the principle illustrated by this experiment.


The diagram below shows three different modes of vibration P, Q and R of the same string of a given length.

P Q R
  1. Which vibration will produce a louder sound and why?
  2. Which vibration will produce sound of maximum shrillness (or pitch) and why?
  3. What is the ratio of wavelength of vibrations P and R?

What do you understand by forced vibrations?


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