Solved papers for JEE Main & Advanced JEE Main Online Paper (Held on 9 April 2013)
done JEE Main Online Paper (Held on 9 April 2013) Total Questions - 2
question_answer1) When two sound waves travel in the same direction in a medium, the displacements of a particle located at \['x'\] at time \['t'\] is given by: \[{{y}_{1}}=00.5\,\,\cos \,\,(0.50\,\pi x-100\pi t)\] \[{{y}_{2}}=0.05\,\,\cos \,\,(0.46\,\,\pi x-92\pi t)\] Where \[{{y}_{1}},{{y}_{2}}\] and \[x\] are in meters and t in seconds. The speed of sound in the medium is:
JEE Main Online Paper (Held On 09 April 2013)
question_answer2) An engine approaches a hill with a constant speed. When it is a distance of 0.9 km it blows a whistle whose echo is heard by the driver after 5 seconds. If the speed of sound in air is 330 m/s, then the speed of the engine is:
JEE Main Online Paper (Held On 09 April 2013)