Answer:
Energy dissipated as sound is 55 J
Step-by-step explanation:
Here we have the principle of conservation of energy which states that energy can neither be created nor destroyed but can be transformed from one form to another
Where there is an initial 400 J of thermal energy in the heating element of the electric kettle we have;
Total available energy = 400 J
The energy (heat) transferred to the water is given as 345 J
The heat dissipated as sound of the kettle during heating is then found as follows;
Total available energy = Heat transferred to water + Energy dissipated as sound
400 = 345 + Energy dissipated as sound
∴ Energy dissipated as sound = 400 - 345 = 55 J.