34. Two sound waves of slightly2 different frequencies f and / V2 cos(2m1) produce sound that is alternat- ing loud and soft. This phe- nomenon, which is called 00 01 0.15 0.2 0.25 0.3 beating, is described by the equation: Time (s) Make a plot of the beating sound (shown) for osIs0.3 s for the case that 130 Hz and -120 Hz