A hypothesis says the upper limit in frequency a human ear can hear can be determined by the diameter of the eardrum, which should have approximately the same diameter as the wavelength at the upper limit. Using the hypothesis what would be the radius of the eardrumfor a person able to hear frequencies up to 18.5 kHz?

Question

...should I be finding the amplitude of the wave which would equal the diameter..if yes then how do i go about doing this?

Answer 1

It says it itself: drum diameter = wavelength for 18.5kHz

wavelength = V/f = 330/18500 (metres)

or 1.78 cm