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Beat Frequencies. Assume two waves are superpositioned Amplitudes are the same Frequencies & wavelengths are different Use fact that. to yield. Groups and phases. Cosine portion defines “envelope” within which sine portion oscillates Envelope moves with a speed.

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beat frequencies
Beat Frequencies
  • Assume two waves are superpositioned
    • Amplitudes are the same
    • Frequencies & wavelengths are different
  • Use fact that

to yield

groups and phases
Groups and phases
  • Cosine portion defines “envelope” within which sine portion oscillates
  • Envelope moves with a speed
  • Individual sine waves move with a speed of
slide4
Beat frequency is the frequency associated with the group packet
  • As frequencies get closer together, beat frequency goes down
  • Beat frequencies are often used with Doppler shifts to determine speed
slide5

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Answer Now

You have two tuning forks that have a beat frequency of 2 Hz with respect to each other. One of them has a frequency of 440 Hz, but you do not know the frequency of the other. You place a small piece of clay on the other, an amount just capable of changing the beat frequency by 1 Hz, and you repeat the experiment. This time the beat frequency is 3 Hz. From this information, what is the frequency of the other tuning fork (when it has no clay on it)?

  • 442 Hz.
  • 443 Hz.
  • 438 Hz.
  • 437 Hz.
slide6

30

0 of 1

Answer Now

You have two tuning forks that have a beat frequency of 2 Hz with respect to each other. One of them has a frequency of 440 Hz, but you do not know the frequency of the other. You place a small piece of clay on the other, an amount just capable of changing the beat frequency by 1 Hz, and you repeat the experiment. This time the beat frequency is 3 Hz. From this information, what is the frequency of the other tuning fork (when it has no clay on it)?

  • 442 Hz.
  • 443 Hz.
  • 438 Hz.
  • 437 Hz.
slide7
A beat frequency of 150 Hz is produced by an ultrasonic echo mixed with its original frequency of 2.50 MHz after being reflected from the heart wall of a patient. What is the speed of the wall? Take the speed of sound in the body as being1540 m/s.
what is the speed of the heart wall

30

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Answer Now

What is the speed of the heart wall?
  • 7.70 x 102 m/s
  • 1,49 x 103 m/s
  • 4.62 x 10-2 m/s
  • 9.24 x 10-2 m/s