The sound intensity level, B is measured in decibels (dB), of a sound of intensity I, measured in watts per square meter, is defined as B=10 log I/Io where Io = 10^-12 watt per square meter is the least intense sound that a human ear can detect. (a) Determine the sound intensity level of normal conversation with sound intensity of 3.2 x 10^-6 watt per square meter. Leave your answer in 2 decimal places. (2 marks)

(b) If a speaker has sound intensity level at 240 dB, what is its sound intensity? (3 marks)