Two Speakers Emit Coherent Sound Waves into the Open Air

question 54

Multiple Choice

Two speakers emit coherent sound waves into the open air.One of them produces 75 W of power.If a microphone placed at 12 m from each of the two speakers receives a total intensity of 0.25 W/m²,what is the power output of the second speaker?

• A) 151 W
• B) 377 W
• C) Need more info to solve.
• D) 38 W