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Question
The pitch of the whistle of an engine appears to drop to`(5/6)^"th"` of original value when it passes a stationary observer. If the speed of sound in air is 350 m/s then the speed of engine is ____________.
Options
35 m/s
70 m/s
105 m/s
140 m/s
MCQ
Fill in the Blanks
Solution
The pitch of the whistle of an engine appears to drop to`(5/6)^"th"` of original value when it passes a stationary observer. If the speed of sound in air is 350 m/s then the speed of engine is 70 m/s.
Explanation:
`"n'" = "n"("v"/("v" + "v"_s))`
`"n'"/"n" = ("v"/("v" + "v"_s))`
`5/6 = 350/(350 + "v"_s)`
`"v"_"s" = 70 "m/s"`
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Doppler Effect
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