1- sound source is doubled , what would appear to happen to its intensity 2-A sl

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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