13why c is absurd....explain
A vehicle approaches a stationary observer from a distance. Which of the following graphs describes the frequency heard by a stationary observer?
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29 Answers
1thats it !!
c and d are totaly absurd !
b is linear !
so ! ...have to adjust with a [6]
13as the vehicle approaches a stationary observer from a distance the frequency increases with time...but not linearly
1f is then inversly proportional to the time !!
and........guys no one thinks its (b) ???
3no v is not constant wid time
u have to take the component of the velocity along the source and the observer da
1n' = n0(c)/(c-v)
n' = n0(c)/(c+v)
hmmmm ya so a is corr as v is const wid time
106sry guys again!!
x axis is time even i got confused and looked it up again
33
which case..1 or 2 .. it should be 2 as in 1 no change in freq...
but if its case 2 how can be x=0... but it is in graph..
or it x is distance...from foot of perpendicular from O to line of motion..
3n'= n(c/c-v) for the points between A and C
which is gr8er than n
At the pt A no doppler effect there fore n'=n
After pt A
n'=n(C/C+v)
which is lesser than n
and so the graph will not c and d
the graph will not be linear can be proved by finding the component of velocity along the object
1the graf shud also depict -ve x....
provided x-axis is displacement
3guys this is multiple choice question if the options were correct and so it shud satisfy the condns given by me.
only graph A satisfies my condns
1i feel dats c coz as d observer is satinary n d vehicle is approaching it
n'=n(v/(v-s))
so frequncy of sound ehard by observre shud increase :S
3let O be the observer At the pt A the doppler effect is zero and at the point B the observed frequency shud be lower than the original frequency and also the variation of the frequency is not linear.under these condition graph A only satisfies
