An ambulance has a siren producing sound waves of frequency 2000 Hz and moving towards a listener standing on a bus stop. If the frequency heard by him is 2150 Hz. Find speed of ambulance. (Speed of sound 340 m/s)?

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Answer 1 · 2017-12-12T10:29:58

23.7 m/s

The Doppler Effect for an approaching source gives us:

#sf(f_(obs)=[(v)/(v-v_("source"))]f_("source"))#

#:.##sf(2150=[(340)/(340-v_("source"))]xx2000)#

#sf(340-v_("source")=316.28)#

#sf(v_("source")=23.7color(white)(x)"m/s")#