Final answer:
The sonometer wire will continue to vibrate at its natural frequency of 240 Hz when subjected to a 480 Hz frequency from a tuning fork, without resonance.
Step-by-step explanation:
When a tuning fork with a frequency of 480 Hz is used to vibrate a sonometer wire with a natural frequency of 240 Hz, the wire will vibrate with a frequency. If the tuning fork's frequency is different from the wire's natural frequency, resonance will not occur.
Thus, the wire will not vibrate at the forced frequency but will continue to vibrate at its own natural frequency provided it is not damped. So the correct answer would be A. 240 Hz.