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Question
A source of sound is moving with constant velocity of 30 mis emitting a note of frequency 256 Hz. The ratio of frequencies observed by a stationary observer while the source is approaching him and after it crosses him is ______. (speed of sound in air = 330 m/s)
Options
6 : 5
9 : 8
5 : 6
8 : 9
MCQ
Fill in the Blanks
Solution
A source of sound is moving with constant velocity of 30 mis emitting a note of frequency 256 Hz. The ratio of frequencies observed by a stationary observer while the source is approaching him and after it crosses him is 6 : 5.
Explanation:
Vs = 30 m/s n0 = 256 Hz
`"n"_1 = "n"_0"V"/("V - V"_"s")`
`"n"_2 = "n"_0 "V"/("V + V"_s)`
`therefore "n"_1/"n"_2 = ("V + V"_"s")/("V - V"_"s") = 360/300 = 6/5`
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Doppler Effect
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