3. If all wavelengths travel at the same speed, the pulses shown travel without

Question

3. If all wavelengths travel at the same speed, the pulses shown travel without changing shape. The pulses traveling to the right hit a fixed bolt in a wall. How are they reflected? SHow how left and right traveling pulses can add (seperpose) into a null result. What happens then?

4. What is the reflection of a pressure wave from the end of an open pipe? In this case, can a reflected wave cancel an incoming wave?

5.Standing waves are set up in a string fixed at both ends. Know about nodes and antinodes. If a string has an initial shape shown below, will other harmonics be needed?

6. Suppose the shape is:

What is the domiante harmonic? With an arbitrary initial shape, are many harmonics included in the tone? Why?

7. Can a standing pressure wave be set up in a pipe open at one end?

8. Suppose the pipe is open at both ends. Is the wave shown below possible? Explain.

9. what is the motion in the air column: up and down or left and right? What initiates the wave, and what is the restoring force?

10. Two turning forks have frequencies of 500 hz each. One moves at a velocity much less than the speed of sound. The Doppler shift is to 507 hz. What frequencies are heard? What is the direction of motion?

Please show work and explain.

Explanation / Answer

3] the pulse if hit by a wall changes it phase by pi

so if the wave was travelling in positive x-direction than it gets reflected to negative x axis and its amplitude remains the same but it gets from positive y to negative y

the two waves result in a null when they have equal and opposite amplitude with the same travelling speed and frequency

4] yes in this case also it can cance;l a incoming wave

in this case a pressure wave is created

and the open pipe is reflected from the maximum pressure zone that is the air (1 atm)and it gets reflected and changes phase by pi

5] The figure is unvailable

6]..The dominant region for pitch for complex tones with low fundamental frequency (F0) was
investigated. Thresholds for detection of a change in F0 (F0DLs) were measured for a group of
harmonics embedded in a group of ?xed non-overlapping harmonics (group A) with the
same mean F0. It was assumed that F0DLs would be smallest when the harmonics in group fell
in the dominant region

7]yes a standing pressure zone can be created in an open pipe at one end

9] the motion is left and right of the compression and the rarefraction

the restoring force is the change in the pressure of the air inside tyhe air column

10 ]the frequency heard = 507+ 500 = 1007 hz

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