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[" 19.A source of sound is moving with c...

[" 19.A source of sound is moving with constant velocity "],[" of "20m/s" cmitting a note of frequency "1000Hz],[" The ratio of frequencies observed by a station- "],[" ary observer while the source is approaching him "],[" and after it crosses him will be: (Speed of sound "],[v=340m/s" ) "],[[" (a) "9:8," (b) "8:9],[" (c) "1:1," (d) "9:10]]

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