A Simple Approach to Algebra and Higher Order Thinking Skills Su, Sico, Su 1) Th
ID: 3186385 • Letter: A
Question
A Simple Approach to Algebra and Higher Order Thinking Skills Su, Sico, Su 1) The loudness L of a sound (in decibels) is related to the intensity I of the square meter by the equation: L-101 log 1-log 10-12 y Note: An intensity of 10 12 is the faintest sound that can be heard by humans in watts i square meter. What is the decibel level of a jet plane that has an intensity level of 10 watts pet meter? sa a) 110 b) 122 c) 128 d) 130 12) The intensity level of the sound of rushing water made by the Niagara Falls is calculated to be 0.003 watts per square meter (I). Approximately what is the decibel level of the Niagara falls Use L -101 log I - log 10-12 ]. a) 85 b) 95 c) 100 d) 105Explanation / Answer
L = 10 [ log I - log 10^-12 ]
= 10 [ log 10 - log10^-12 ]
= 10 [ 1 - log 10^-12 ]
= 10 [ 1 + 12 ]
= 130
option d is correct
2) L = 10 [ log I - log 10^-12 ]
L = 10 [ log .003 - ( -12 )]
= 95
option b is correct