Ultrasonic cleaning is widely used for delicate electronic components such as watch parts, circuit boards, and optical lenses.
(i) Draw or describe a flow chart showing the sequence of operations in an ultrasonic cleaning bath from the moment the power is switched on to the removal of cleaned parts.
(ii) Explain in detail how cavitation helps to remove dirt from surfaces.
(iii) Identify any two factors that affect the efficiency of ultrasonic cleaning and describe how each factor influences the outcome.
(iv) Suggest one safety precaution that should be observed while operating an ultrasonic cleaner and give its reason.