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chapter 12 Question 10 On a warm summer day (33 ∘C), it takes 4.70 s for...

chapter 12

Question 10

On a warm summer day (33 ∘C), it takes 4.70 s for an echo to return from a cliff across a lake. On a winter day, it takes 5.10 s . The speed of sound in air is v≈(331+0.60T)m/s, where T is the temperature in ∘C.
Part A
What is the temperature on the winter day?
Express your answer to two significant figures and include the appropriate units.

Tw =  

Question #12

A 52-dB sound wave strikes an eardrum whose area is 5.0×10−5m2. The intensity of the reference level required to determine the sound level is 1.0×10−12W/m2. 1yr=3.156×107s.
Part A
How much energy is absorbed by the eardrum per second?
Express your answer to two significant figures.


P =  
W
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Part B
At this rate, how long would it take the eardrum to receive a total energy of 1.0 J?
Express your answer using two significant figures.


t =  
nothing
yr
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