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![[Post New]](/templates/default/images/icon_minipost_new.gif) 2 Apr 2008 10:27:48 IST
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jee 07 question
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b)see
the fact is that for A now the passengers are behind the engine ie the sound will travel opposite to the direction of motion of train hence
v A = 340 + 20 = 360 ie the velocities are added
for B
the motion of train is in same direction as that of the sound hence
v B = 340 - 30 = 310
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Impossible To be Impossible is Impossible |
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2 Apr 2008 10:49:30 IST
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@ anchit..isnt the source of the whistle also moving???
wrt to the passengers of A,they r stationary n so is the engine..so y shudn it be 340 itself?
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Nitwit Blubber Odment Tweak
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2 Apr 2008 10:51:49 IST
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acc to me it shud be 340 and 330 which is not an option..pls temme where im wrong
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Nitwit Blubber Odment Tweak
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2 Apr 2008 11:03:40 IST
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Re:jee 07 question
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Impossible To be Impossible is Impossible |
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2 Apr 2008 11:06:18 IST
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gokul i think anchit is rite.....
velocity of sound in stll air is 340m/s .....you dont add the velocity of source to the sound...however iam also not too sure of my ans
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"I a universe of atoms.......an atom in the universe" |
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2 Apr 2008 11:06:22 IST
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the source is also moving
consider wrt ppl of train...u r sittin in the train...wrt 2 u the engine is stationary and u r stationary so how can u get anything diff from 340??
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2 Apr 2008 11:07:28 IST
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4get adding up n all...consider u r in the train n refer my above post
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2 Apr 2008 11:11:58 IST
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i think u are confusing frequency with velocity
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2 Apr 2008 11:12:35 IST
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no way..pls read my above posts
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2 Apr 2008 11:15:17 IST
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did u try to understand the figure i gave ?
see the fact is that sound will move with 340 m/s
it has nothing to do with the train and anything else
now we take into consideration the passenger of A train
hence i got that answer
but still what is the answer ??
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2 Apr 2008 11:21:10 IST
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Re:jee 07 question
consider that at time t=0 a sound wave is emitted
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"I a universe of atoms.......an atom in the universe" |
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2 Apr 2008 11:22:10 IST
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Shud be d)... Only the frequency heard by the observes changes.. .speed of sound remains the same for the two passengers
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Will nip in at times to solve problems :)
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2 Apr 2008 11:22:16 IST
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hence the approach velocity is 360m/s
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2 Apr 2008 11:23:46 IST
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