Follow the link to the PhET simulation to help answer the questions below. LINK
ID: 1491702 • Letter: F
Question
Follow the link to the PhET simulation to help answer the questions below.
LINK : https://phet.colorado.edu/en/simulation/wave-on-a-string
STEP A:
What happens to the wave produced on the string if you move the wrench up and down in one continuous motion? Describe fully, both the wave moving down and reflecting back from the c-clamp.
STEP B:
Now, continue to push the wrench up and down at varying frequencies. Can you find a frequency where the wave appears to be very close to the same amplitude exiting from the wrench and reflecting off the c- clamp? Describe efforts and results. It is a good idea to make a sketch here of the wave patterns seen since a screen shot is difficult with manual movement of the
wrench.
STEP C:
Next, choose pulse and watch the path of the pulse down and back from the c-clamp. What can be said of the forward and returning waves? How does this motion relate to what was seen in #1 and #2?
STEP D:
Now choose oscillate, adjust the damping down if needed but not to zero and examine the motion of the string as you change the frequency. You may also want to change the amplitude if needed to easily see the wave. Finally click on the reference line in the lower right hand corner. Move the reference line to the maximal height of t
he outgoing wave. Now, tune the frequency until you have what appears to be a standing wave. Sketch an image of the
number of nodes seen and record the frequency obtained.
STEP E:
Using this frequency, find at least 2 other standing waves (resonant frequencies) by adjusting only the frequency and if desired amplitude sliders. Record the new frequencies as well as the number of nodes observed.
STEP F:
What happens in the simulation when you change the tension? Describe fully.
STEP G:
If the string used was stretchy, would the linear density change as one pulled more on the string (adding more tension)? Discuss
your reasoning fully.
STEP H:
What happens when you increase the damping of the system? Hypothesize what could cause the damping in a real experiment conducted in lab.
Explanation / Answer
A : We can say from the diagram that,wave travels from one end to other end(fixed end) and gets reflected at that end. When each reflected wave reaches point A, it gets reflected again and the process repeats. Of course the hand motion keeps putting energy into the system by constantly generating waves that are in phase with the returned waves creating the above waveforms. Such waves are called "standing waves."