A sound's noise level is measured in decibels (dB) by comparing the sound's intensity, [math], to a benchmark sound that has an intensity of [math] watts/cm[math]. In particular, [math]

a) The intensity of Joel's whisper is approximately [math] watts/cm[math]. Compute the noise level of the whisper in decibels.

b) A certain sound with a noise level of 96 dB has been known to damage hearing. Compute the sound's intensity at this noise level.

c) Kansas City Chiefs' fans recently broke the world record for "loudest roar" at a sports event. The fans reached a noise level of 142.2 dB. The previous world record was held by Seattle Seahawks' fans, with a noise level of 137.6 dB. About many times more intense was the roar of the Chiefs' fans than the roar of the Seahawks' fans?