# Joint Entrance Examination/AIEEE 2009/Q080 DOPPLER EFFECT

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| Original Question by 164.100.170.4 Here's the question... Q80. A motor cycle starts from rest and accelerates along a straight path at 2 m/s$^2$. At the starting point of the motor cycle there is a stationary electric siren. How far has the motor cycle gone when the driver hears the frequency of the siren at 94% of its value when the motor cycle was at rest ? (Speed of sound = 330 ms$^{–1}$) (1) 98 m (2) 147 m (3) 196 m (4) 49 m Posted by 164.100.170.4 12:08, 24 September 2009 (UTC) Post a reply! | What's Up? Latest discussions on the forum Waves-And-Oscillations User:Thewinster/HHF/Waves-And-Oscillations-Preload Joint Entrance Examination/AIEEE 2009/Q080 DOPPLER EFFECT Joint Entrance Examination/AIEEE 2009/Q086 SHM Physics-Help User:Thewinster/Sandbox/Forum-Watch User:Thewinster/Sandbox Joint Entrance Examination/2000 Screening/Q021 Ionized gas subjected to electric and magnetic fields Joint Entrance Examination/2000 Screening/Q022 Radioactive materials and decay constant Joint Entrance Examination/2000 Screening/Q006 Bohr model of an atom applied to an atom with some hypothetical particle |
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Category AIEEE 2009
Reply to the thread, posted by 164.100.170.4
Thread post
Additional notes
f′ =f[v –v$_0$]/v
speed of sound=v
speed of observer=v$_0$
⇒ 0.94 = 1– v$_0$/v
⇒ v$_0$ = 19.8 m/s
⇒ Distance covered =
[v$_0$]$^2$/2a= 98 m
These comments, along with the notes on the left, were contributed by 164.100.170.4 12:17, 24 September 2009 (UTC) :
AIEEE 2009