Can you help me with this please. I tried but I don\'t understandhow to cancel o
ID: 1680183 • Letter: C
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