Question 5. A small child squeals loudly near an adult's ear. The sound is characterised by a frequency of 1200 Hz, and an intensity at the ear of 0.62 W/m2. (a) Given that the speed of sound in air is 340 m/s, what is the wavelength of the soundwave? (1 mark) (b) The adult's eardrum has an area of 5.1 x 10-5 m2. How much sound power is incident on the eardrum? (1 mark) (c) How much energy could be transferred to the eardrum if it was exposed to this noise for one minute? (1.5 marks) (d) What is the corresponding sound intensity level? (1.5 marks)