Car a Moves at Speed V Toward Car B,which Is

question 82

Multiple Choice

Car A moves at speed v toward car B,which is at rest.The frequency of car A's horn is observed by car B to be f.What is the frequency of car A's horn as heard by an observer in car B if car A is at rest and car B moves at speed v toward car A (assume there is no wind) ?

• A)f
• B)greater than f
• C)less than f
• D)either greater than or less than f
• E)2f

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