Go back to the Sound Simulation once again. The one we used before, called Sound

Question

Go back to the Sound Simulation once again. The one we used before, called Sound, found at phet.colorado.edu/en/simulation/sound This time, click on the "two source interference" tab, and play around. Try different frequencies. You can drag the listener up and down the screen now, as well as in and out. Move the head around and listen to what the "person" hears. (It's important that you listen after you've stopped dragging: the motion when you're dragging has a subtle effect on what you hear that we're not going into just yet.)
After playing for a bit, come back here and decide whether each of the following statements are T-True, or F-False. (If the first is T and the rest are F, enter TFFFF.)

A) As you move the listener to different points, there is more than one physical location where destructive interference occurs (soft spots).
B) You can only get constructive and destructive interference if waves are longitudinal (transverse waves don't exhibit interference in the same way).
C) If the distance from listener to speakers is different by exactly half of a wavelength, the sound cancels out at this point (destructive interference).
D) If the distance from listener to speakers is different by exactly one full wavelength, the sound cancels out at this point (destructive interference).
E) The distance you need to move the listener to get from one interference minimum to the next (one quiet spot to the next) is larger if the frequency of the sound is higher.

Be careful to input your answer as a string of 5 T's and F's, in order. (No spaces or any other characters)


For you to think about: How would the sound pattern CHANGE if one of the speakers died, but the other continued playing the same as before? Would the loud spots get louder, softer, stay the same? Why? What about the soft spots? Do these questions have any practical relevance to setting up stereo speakers in your room? Why and how?

Explanation / Answer

A. False

B. False constructive and destructive interference can also occur for waves on a string or water waves which are both transverse waves.

C. True

D. False

E. True when the frequency of the sound is higher the wavelength becomes smaller so the spatial pattern on the screen looks more compressesd

Answer is FFTFT

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