Can you help me with this please. I tried but I don\'t understandhow to cancel o

Question

Can you help me with this please. I tried but I don't understandhow to cancel out log.

A train sounds its horn as it approaches an intersection. The horncan just be heard at a level of 52 dBby an observer 10 km away.
(a) What is the average power generated by thehorn?
1_____________ W

(b) What intensity level of the horn's sound is observed by someonewaiting at an intersection 53 m fromthe train? (Treat the horn as a point source and neglect anyabsorption of sound by the air.)
2_____________ dB


(a) What is the average power generated by thehorn?
1_____________ W

(b) What intensity level of the horn's sound is observed by someonewaiting at an intersection 53 m fromthe train? (Treat the horn as a point source and neglect anyabsorption of sound by the air.)
2_____________ dB

Explanation / Answer

    for (a) and (b)     we know that     intensity = power / A     I = P / A     where     A = r2         = (3.14) (10 x103 m)2

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