Go to the Java Applet on the Doppler effect at http://lectureonline.cl.msu.edu/~

Question

Go to the Java Applet on the Doppler effect at http://lectureonline.cl.msu.edu/~mmp/applist/doppler/d.htm.

Click on the gray rectangle to make the blue dot (the source) appear. What will happen to various parameters when the source moves? (Select all that apply.)

a) The source frequency changes.

b) The observed frequency in front of the dot is higher than the source frequency.

c) The observed frequency behind the dot is higher than the source frequency.

d) The observed frequency behind the dot is lower than the source frequency.

e) The speed of sound changes.

f) The observed wavelength in front of the dot decreases.

g) The observed frequency in front of the dot is lower than the source frequency.

Explanation / Answer

c. The observed frequency in front of the dot is higher than the source frequency.

d. The observed frequency behind the dot is lower than the source frequency.

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