Friday
April 25, 2014

Homework Help: physics

Posted by kate on Sunday, May 17, 2009 at 11:43am.

I have a few questions that i am not too sure how to figure out...
1- as a racing car zooms by you, its pitch decreases by 20%. If the speed of sound is 345m/s, how fast is the car travelling?

2-a person has a threshold of hearing of 5db. another person has a threshold of hearing of 25db. Which person has better hearing and by how much?

PLEASE HELP! :(

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