Ajackhammer is causing vibrations in a wall that is connected to the concrete being jackhammered. when the hammer is stopped, the wall ceases to vibrate. this type of vibration is:
resonance
forced vibration
an example of beats
none of the above

answer: the correct answer is resonance.

explanation:

resonance: resonance occurs when the driven frequency of the oscillating system is matched with the natural frequency.

force vibration: when the system is driven repeatedly by the external agency then the type of vibration will be forced vibration.

beats: it is the interference of the sound waves having slightly different frequency.

in the given problem, a jackhammer is causing vibrations in a wall that is connected to the concrete being jack hammered. when the hammer is stopped, the wall ceases to vibrate. this is due to the resonance phenomenon. here, the driven frequency is matched with the natural frequency of the concrete.

therefore, the type of vibration in the given problem is resonance.