Question

When a body vibrates under periodic force the vibration of the body is always:

• A. At the same frequency as the periodic force
• B. At twice the frequency of the periodic force
• C. At half the frequency of the periodic force
• D. Independent of the frequency of the periodic force

Answer 1

Answer:

A. At the same frequency as the periodic force

At the same frequency as the periodic force

This is known as forced vibration. The body vibrates at the frequency of the external force, not necessarily at its natural frequency.