Two sinusoidal sound waves with frequencies 108 Hz and 112 Hz arrive at your ear simultaneously. Each wave has an amplitude of 1.5 × 10 –8 m when it reaches your ear.
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A frequency of 
(108 Hz + 112 Hz) = 110 Hz will be heard, with a beat frequency of 112 Hz – 108 Hz = 4 beats per second.
The maximum amplitude is the sum of the amplitudes of the individual waves, 2(1.5 × 10 –8 m) = 3.0 × 10 –8 m. The minimum amplitude is the difference, zero.
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