physics

posted by .

1. A sound is made by a speaker, which then radiates in all directions. The sound wave
is described by
A(r) sin(2r - 600t)
where the distances are in meters, and the time in seconds. The A(r) just indicates that
the amplitude has some distance dependence--it decreases smoothly as the wave gets
farther from the source

a) What is the velocity of this wave?

b) How long does it take for the sound to travel from the speaker to a listener 100 m
away (the length of a football field)?

  • physics -

    velocity?

    freq*lambda=velocity

    freq= 600/2PI

    lambda= 2PI/2=PI

    velocity= 600/2PI * PI= 300m/s

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    You are standing 7.0 meters from a sound source that radiates equally in all directions, but it is too loud for you. How far away from the source should you stand to experience one third the intensity that you did at 7.0 meters?
  2. physics

    15.0 meters from a sound source that radiates freely in all directions, the intensity is 0.000550 W/m2. What is the rate at which the source is emitting sound energy?
  3. physics

    Two speakers are separated by distance d1 = 2.40 m and are in phase. You are standing 3.00 m directly in front of one speaker. Each speaker has an output power of 1.20 W. Because the speakers are at different distances, there will …
  4. Physics

    15.0 meters from a sound source that radiates freely in all directions, the intensity is 0.00230 W/m2. What is the rate at which the source is emitting sound energy?
  5. physics

    at a distance of 3.8 m from a siren, the sound intensity is 3.6 x 10-2 W/m2. Assuming that the siren radiates sound uniformly in all directions, find the total power radiated.
  6. physics

    An audio speaker at a concert emits sound uniformly in all directions at a rate of 100 W. (i) Calculate the sound intensity experienced by a listener at a distance of 8 m from the speaker. The listener moves back from the speaker to …
  7. Physics

    A spherical source radiates sound uniformly in all directions. At a distance of 12 m, the sound intensity level is 100 dB. At what distance from the source is the intensity level 40 dB?
  8. Physics

    A spherical source radiates sound uniformly in all directions. At a distance of 12 m, the sound intensity level is 100 dB. At what distance from the source is the intensity level 40 dB?
  9. Physics

    A spherical source radiates sound uniformly in all directions. At a distance of 12 m, the sound intensity level is 100 dB. At what distance from the source is the intensity level 40 dB?
  10. Physics

    There is a band who uses 10000 W to radiate sound energy in all directions. What was the intensity of sound 10 meters from this speaker?

More Similar Questions