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124quiz3solutions

# 124quiz3solutions - Math 124 Quiz 3 Sept 21 2006 Name 1 The...

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Math 124 Quiz 3 Sept. 21, 2006 Name: 1. The noise level, N , in decibels, of a rock concert is given by N = f ( d ), where d is the distance in meters from the concert speakers. What do the following quantities mean to someone who lives in the neighborhood of the concert? Give units for the quantities. (a) f (100). (b) f (1000). (c) d such that f ( d ) = 100. (d) Explain in words what it means if f (100) > f (1000). Solutions: (a) For a person who lives 100 meters from the speakers, f (100) represents approximately how much the decibels will decrease if they were to move 1 meter further away. (b) For a person who lives 1000 meters from the speakers, f (1000) represents approximately how much the decibels will decrease if they were to move 1 meter further away. (c) d such that f ( d ) = 100 is the distance at which the decibel level is 100. (d) For someone living 100 meters away, the approximate decrease in decibels by moving 1 meter away is larger than that for someone living 1000 meters away.

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