Final answer:
The frequency of noise made by George's ear piece cannot be determined based on the given information.
Step-by-step explanation:
The question asks how often George's ear piece makes noise. Based on the provided information, it is difficult to determine the frequency of the noise.
However, the use of words like 'sharp little sound' suggests that the noise occurs occasionally or sporadically, rather than continuously.
Without further context or information, it is not possible to give a specific answer to the question regarding the frequency of the noise made by George's ear piece.