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.

a. The wave velocity will decrease compared to the stationary source and remain constant at the lower value.

b. The wave velocity will decrease compared to the stationary source and continue to decrease.

c. The wavelength will increase compared to the stationary source and remain constant at the higher value.

d. The wave velocity will remain constant.

e. The frequency will decrease compared to the stationary source and continue to decrease.

f. The wavelength will increase compared to the stationary source and continue to increase.

g. The frequency will decrease compared to the stationary source and remain constant at the lower value.

Explanation / Answer

If we the observer is standing at upper left corner, while plane moves from upper left corner to bottom right corner, following is noticed in conjuction with Doppler's Effect ;-

Doppler effects says " that if moving source making waves is approaching observer (stationary observer), then waves (each) will take less time to reach observer and if source is moving away from observer, the waves will take more time to reach observer (if observer is stationary)". The reason being " when object is moving away from observer, the time required by waves to reach observer increases, because source is moving away, and hence frequency will reduce, wavelength will diminish and velocity will decrease.

Answers:-

Hence option (e) is the answer that " The frequency will decrease compared to the stationary source and continue to decrease"

Also, option (f) The wavelength will increase compared to the stationary source and continue to increase.

Further, opdtion (b) The wave velocity will decrease compared to the stationary source and continue to decrease

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