Two small speakers A and B are driven in step at 720Hz by the same audio oscilla

Question

Two small speakers A and B are driven in step at 720Hz by the same audio oscillator. These speakers both start out 4.50m from the listener, but speaker A is slowly moved away. (See the figure (Figure 1) ).

Part A

At what distance d will the sound from the speakers first produce destructive interference at the location of the listener?

SubmitMy AnswersGive Up

Part B

If A keeps moving, at what distance d will the speakers next produce destructive interference at the listener?

SubmitMy AnswersGive Up

Part C

After A starts moving away, at what distance will the speakers first produce constructive interference at the listener?

Two small speakers A and B are driven in step at 720Hz by the same audio oscillator. These speakers both start out 4.50m from the listener, but speaker A is slowly moved away. (See the figure (Figure 1) ).

Part A

At what distance d will the sound from the speakers first produce destructive interference at the location of the listener?

d =   m  

SubmitMy AnswersGive Up

Part B

If A keeps moving, at what distance d will the speakers next produce destructive interference at the listener?

d =   m  

SubmitMy AnswersGive Up

Part C

After A starts moving away, at what distance will the speakers first produce constructive interference at the listener?

Explanation / Answer

For destructive interference the distance should be (2n-1)?/2where n = 1,2,3 etc.
For the first destructive interference the distance d = ?/2

Part A -
?/2 =c/2n = 344.16 / 2*720 = 0.239m

Part B
3*0.236 = 0.717

Part C
The distance is ? = 2*0.239 = 0.478m

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.