Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
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Paltu Sen
To solve the problems of Doppler effect of sound remember the single formula. when observer approaches source use + sign of Vo and when recedes use ' - 'sign. when source approaches observer use minus sign of Vs and + if recedes. simply you need to increase frequency when source and observer come close together and decrease if when they go away from each other