24Shouldnt the frequncy remain same ???
A large cylinder has an acoustic source at it's base....A small man is sitting at a corner of the cylinder and at time t=0 starts moving towards the source.... - he thereby detects a frequency f_0...Now the chamber is heated isobarically (Process1)....then brought back to it's original state and then hetaed isochorically (Process-2).
1) Frequency detected by the man in P-!
i) >f0 ii)<f0 iii)=f0 iv) Data insufficient.
2) Frequency detected in P-2 :-
Same options.
I'm getting iv) for both.....bcoz in both the processes we have the eqns V=KT & P=KT......we don't know whether temperature is increasing or not.....but answers given are different.....
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5 Answers
1bhaiya
can we say that the container should be closed(assuming)
volume is constant . while heating the gas isobarically the amount of heat absorbed is equal to released by the gas . so, no net increase in temp.
while in isochoric process temp. increases.
11No eure - it velocity of sound depends on temperature....so doppler frequency changes!
24well ya velcoity depends upon temp and so does wavelngth.....
i have read that freqncy is property of source..and hte only condns when it can change is relative motion b/w source and observer..
btw what are the answers??
11But doppler effect eure - this frequency is not the actual frequency of the source, it is the frequency as received by yhis unfortunate man in the cylinder.....