Resources: Table of Common Decibel Values Power ratio Decibel value (dB) 0.001 0.01 Decibel value (dB) Voltage ratio 0.001 0.01 0.1 0.125 0.25 40 0.1 0.125 0.25 0.5 0.79 -12 0.707 -1.5 1 414 88 100 100 1000 1000 Questions: Question 1: Comprehension questions
1. What is a decibel?
2. What is the equation for a decibel?
Question 2: Computation questions
1. Signal A has a strength of 20 dB. Signal B is 10 times less powerful than signal A. What is the strength of signal B in dB?
2. Signal A has a strength of -20 dB. Signal B is 200 times more powerful than signal A. What is the strength of signal B in dB?
3. Signal A has a strength of 13 dB. It is then attenuated by a factor of 40. What is its new signal strength?
4. An increase in 10 dB is a (increase/decrease) by a power factor of
5. A decrease in 10 dB is a (increase/decrease) by a power factor of
6. An increase in 3 dB is a (increase/decrease) by a power factor of
7. A decrease in 3 dB is a (increase/decrease) by a power factor of