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Blazing goIITian

Joined:	21 Nov 2008
Post:	1020

9 Apr 2009 20:17:54 IST

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Waves

Kinematics , NewtonsLawsCirMotion , Work Power Energy collisions , Rotation , Gravitation , Simple Harmonic Motion , Fluid Mechanics , Materials Wave Sound , Super Position , units dimensions , com momentum , shm , wave sound

Earthquakes generate sound waves inside the earth. The earth can experience both transverse(S) and longitudinal(P) sound waves. Typically the speed of S is abt. 4km/s and that of P is 8 km/s. A seismograph records P and S waves from an earthquake. The first P wave arrives 4 min. before the first S wave. At what distance does the earthquake occur?

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Swapnika.... finally into a branded college....NIT m cuming..!!!

Blazing goIITian

Joined: 7 Aug 2008

Posts: 1047

9 Apr 2009 20:18:51 IST

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wat abt waves???? plz specify...

JPS

Blazing goIITian

Joined: 21 Nov 2008

Posts: 1020

9 Apr 2009 20:22:02 IST

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read the question....

AViK

Blazing goIITian

Joined: 5 Sep 2008

Posts: 953

9 Apr 2009 21:46:33 IST

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Let 1st "P" wave reach @ time = t

=> Dist. = Speed*Time

=> d = 8t ....(1)

For "S" wave....time = t + 240 seconds

=> d = 4 (t +240) ......(2)

Solve Eqns (1) & (2)....

v get ....d = 1920 km

Tht shud b the required distance....

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