Derivation of Doppler Effect Frequency Equations

1. What is the general Doppler Effect frequency equation?

   fO = fS(c − vO)(c − vS)Sorry, not correct. Try another button. λO = λS(c + vS)/(c − vO)Good try, but not right. Select another answer. fO = fS(c − vO)/(c − vS)That is correct. You know about Doppler effect equations.

2. How is the frequency equation determined when the source is moving toward a stationary observer?

   You set vS = 0Oops! Wrong answer. Re-read the question and try again. You set vO = 0Correct. Terrific! You set fO = 0Sorry, not correct. Try another button.

3. What is the change in frequency when the observer moves toward a stationary source?

   Δf = vOfS/cOops! Wrong answer. Re-read the question and try again. Δf = −fS vS/(c − vS)Good try, but not right. Select another answer. Δf = −vOfS/cThat is correct. You know about Doppler effect equations.

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