1- sound source is doubled , what would appear to happen to its intensity 2-A sl
ID: 1367544 • Letter: 1
Question
1- sound source is doubled , what would appear to happen to its intensity
2-A sleeping dog startled by robber as he is coming into a yard The dog produces db of sound a distance of 12 meters from the robber. Determine the intensity so by the robber. If 5 more dogs of equal volume of sound to the robber.
3-As you stand beside railroad track waiting train passes and you hear a frequency 476 as it e coaches and 404 a hz- it moves away f you. The speed of sound is 343 m/s determine the speed of the train
Explanation / Answer
1)
intensity = power/area
as the power os the source doubles the intensity also doubles
(2)
the deibel level of sound of dog is missing
(3)
apparent frequency while approaching
f1 = fo*v/(v - vs)
apparent frequency while moving away
f2 = fo*v/(v + vs)
f1/f2 = (v+vs)/(v-vs)
476/404 = (343+Vs)/(343-vs)
speed of train = Vs = 28.06 m/s
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