Question

Suppose that a public-address system emits a 494 Hz sound uniformly in all directions. (a) If...

Suppose that a public-address system emits a 494 Hz sound uniformly in all directions. (a) If the air temperature is 25oC (sound travels at 346 m/s), what is the wavelength of this sound? (b) If the intensity at a location 22 m away from the sound source is 3x10-4 W/m2 , what is the power of the sound coming from the speaker?

0 0
Add a comment Improve this question Transcribed image text
Answer #1

a)
v = flambda

lambda = rac{v}{f}

346 494

λ = 0.7m

b)

Assuming that spherical wave is emitted from the source,

P = I * 4pi R^{2}

P=(3*10-4 ) * 4π * 22°

P-1.8246

Add a comment
Know the answer?
Add Answer to:
Suppose that a public-address system emits a 494 Hz sound uniformly in all directions. (a) If...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions
ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT