Many people are exposed to loud noises in their working lives, such as made by construction tools, blenders and gardening equipment. Standards have been set to protect workers from damage to their hearing from noise in the workplace. Consider the gardening equipment of a "whipper snipper", which has a motorised fast-moving tool at the end of a pole. The tool can be treated as a point source of sound. Because of the pole, the operator's ears are 1.4 m from the source of the sound. (a) The sound power emitted by the tool is 2.01 102 W. What is the intensity of sound at the operator's ears? (b) i) What is the sound intensity level at the operator's ears? ii) If hearing health is at risk for noises louder than 85 dB, should the operator of this equipment wear ear muffs? Explain why or why not