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What is the intensity of a sound that would result in a sound intensity level of...

What is the intensity of a sound that would result in a sound intensity level of 45.5 dB? Give the answer in scientific E-notation.   

A fixed warning siren produces a pitch (frequency) of 888 Hz. An observer drives directly away from the blaring warning siren at 55.0 mph. Use 343 m/s for the speed of sound in air. What frequency is heard by the observer?   

If the speed of sound in air is found to be 352 m/s with an atmospheric pressure of 1 atm, what is the predicted air temperature in oC? Give the answer with two significant digits.

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