$1.$ You have been asked to help design an auditory alarm for an engine room of a naval vessel.

The design criteria specifies that the alarm must be audible over the engine noise, but not

unnecessarily loud. Two different alarms, in terms of the combinations of sound frequencies,

were developed, and psychophysical tests were run. Results from Alarm A and Alarm B are

shown below. Given these results, which alarm would you recommend, and why? $(6$ points$).$

Alarm A Alarm B

$0\mathrm{.}5$

$0$

dB dB

p$($say $$heard the alarm$)$