Question

question 19 of 20 :
select the best answer for the question.

1. which of the following statements is not true of vibrations?

a. forced vibrations, such as those between a tuning fork and a large cabinet surface, result in a much lower sound than was produced by the original vibrating body.

b. resonance occurs as a result of sympathetic vibrations.

c. a non-vibrating object can begin to vibrate as a result of forced vibrations.

d. two bodies with the same vibration frequency that are placed next to each other will exhibit sympathetic vibrations as one body causes the other to vibrate.

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Explanation:

• For option A: Forced vibrations (like a tuning fork on a large cabinet) actually amplify the sound (the cabinet acts as a resonator, making the sound louder), so saying it results in a much lower sound is false.
• Option B: Resonance is a type of sympathetic vibration where the frequency of the forcing matches the natural frequency, so this is true.
• Option C: Forced vibrations can cause a non - vibrating object to start vibrating (e.g., a guitar string vibrating a nearby object), so this is true.
• Option D: Sympathetic vibrations occur when two bodies with the same frequency are near each other, with one causing the other to vibrate, so this is true.

Answer:

A. Forced vibrations, such as those between a tuning fork and a large cabinet surface, result in a much lower sound than was produced by the original vibrating body.