At a concert you're 8.5 m from a speaker, where the sound intensity level is 99 dB. Report all your final answers rounded to two significant digits. Careful! One miscalculation could cost 6 marks!!!

a. What is the sound intensity 8.5 m from the speaker? (1 mark)

b. What is the power output of the speaker? (1 mark)

c. What is the sound intensity if you are 17 m from the speaker? (1 mark)

d. What is the sound intensity level if you are 17 m from the speaker? (1 mark)

e. How far away should you be from the speaker in order to reduce the intensity level to a more bearable 85 dB? (2 marks)