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प्रश्न
State two ways in which resonance differs from forced vibrations.
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उत्तर
(i) In resonance it is necessary that the frequency of externally applied force should be equal to the natural frequency of the body whereas, it is not necessary for forced vibrations.
(ii) In forced oscillations, the amplitude of oscillations is small whereas, in resonance the amplitude of vibration is large.
संबंधित प्रश्न
Name the phenomenon involved in tunning a radio set to a particular station
Give one example to illustrate forced vibrations.
When a troop crosses a suspension bridge, the soldiers are asked to break steps. Explain the reason.
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 ?
The diagram below shows three different modes of vibration P, Q and R of the same string of a given length.
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 |
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| P | Q | R |
- Which vibration will produce a louder sound and why?
- Which vibration will produce sound of maximum shrillness (or pitch) and why?
- What is the ratio of wavelength of vibrations P and R?
What do you mean by resonance? When does resonance occur?
When acoustic resonance takes place, a loud sound is heard. Why does this happen? Explain.
Explain why are soldiers asked to walk out of step while crossing bridges?
Explain a tuning fork (vibrating) is held close to ear. One hears a faint sound. The same vibrating tuning fork is placed on table, such that its handle is in contact with table, one hears a loud sound.
