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MDCAT
Physics
2018

Physics · Wave Motion and Sound

Work through this past-paper style MCQ, then read the full explanation. Practice more physics questions on mMCQ with adaptive practice and topic analytics.

Question
When the frequency of the applied force becomes equal to one of natural frequencies of body then the body oscillates with maximum displacement this phenomenon is called:
Options
  • A
    Heating
  • B
    Resonance
  • C
    Reverberation
  • D
    Damping
Explanation

Resonance describes the phenomenon of increased amplitude that occurs when the frequency of a periodically applied force is equal or close to a natural frequency of the system on which it acts.

 Heating refers to the process of increasing the temperature of an object or substance. It occurs when energy is transferred to the object, typically resulting in an increase in kinetic energy of its particles, leading to higher temperature. In the context of oscillations and resonance, heating may occur due to friction or other dissipative processes that convert mechanical energy into thermal energy.

Resonance is the phenomenon that occurs when the frequency of an external force applied to a system matches the natural frequency of the system. This results in the system oscillating with maximum amplitude, as energy is efficiently transferred to the system. Resonance can occur in various systems, including mechanical oscillators, electrical circuits, and acoustic systems. In mechanical systems, resonance can lead to structural vibrations or even structural failure if not properly damped.

Reverberation refers to the persistence of sound in an enclosed space due to repeated reflections off surfaces. It is commonly experienced in rooms with hard and reflective surfaces, such as concert halls or empty rooms. Reverberation can affect the clarity and quality of sound, and it is often controlled or mitigated in acoustic design to optimize the acoustic environment.

Damping is the process by which energy is dissipated or removed from a vibrating system, causing its amplitude to decrease over time. Damping can occur due to various factors such as friction, air resistance, or energy transfer to other modes of vibration. It is essential for controlling oscillations and preventing excessive vibration in mechanical systems. In the context of resonance, damping is necessary to prevent the system from oscillating uncontrollably at resonance frequencies.

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Tagged under Physics · Wave Motion and Sound · 2018