Doppler Effect.

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A man stands on the top of a high building with a source of sound with frequency 1000 Hz.He accidently drops the device.Find the frequency of the sound heard by the man 4 seconds after he drops the device?(Speed of sound=320 m/s,g=10 m/s²)?

1)888 Hz
2)860 Hz
3)894.75 Hz
4)930 Hz

#Physics #Mechanics

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4 Answers

383

Soumyabrata Mondal ·2013-03-03 22:09:18

1) 888 Hz

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383

Soumyabrata Mondal ·2013-03-03 22:13:33

n_a=(vv-v_s)n_o
v_sâ†’velocity of the source = 40m/s
v â†’Speed of sound=320 m/s

n_oâ†’1000 Hz

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Gaurav Gardi vs=-40m/s
Upvote·0· Reply ·2013-03-03 22:29:49
Soumyabrata Mondal sorry, typng mistake :(
Upvote·0· Reply ·2013-03-03 22:41:39
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1057

Ketan Chandak ·2013-03-04 00:04:38

dude...did the same thing...got the same answer....but the answer given is not that...

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Gaurav Gardi is it (3)
Upvote·0· Reply ·2013-03-04 00:47:11
Ketan Chandak yes it is....do provide the solution...
Upvote·0· Reply ·2013-03-04 02:52:08
Soumyabrata Mondal but for this ans Vs=37.64
Upvote·0· Reply ·2013-03-04 03:05:32
Soumyabrata Mondal how Vs can be 37.64????
Upvote·0· Reply ·2013-03-04 03:06:10
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15

Anomitro Kundu ·2013-03-23 00:18:21

1000hz

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Anomitro Kundu But this option is not there......
Upvote·0· Reply ·2013-03-23 00:18:50
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