CHART +3 = 2 x +10 = 10 x - 3 = 1/ 2 -10 = 1/10 A wave intensity is 4mw / cm? . There is an increase of + 9 dB . What is the final intensity ? 14 +9dB ZX 2X 2x 2x2 X2 4 x 2 = 8 stranger 8 x 4mW/cm = 32 mW/cm2 A signal is increased in strength 100 times . Determine the amant of change in deabels . 100 Break down x10 710 Positive 10JB 10dB 10 + 10 = 20dB The power in a wave is Increased to look times it's original value . How many decibels correspond to this change 1000 Breakdown 1 +10 flo to I OdBY 1 0dB' 10 dB = 30 dB 100 X 10 =CHART +3 = ZX +10 - 10 x - 3 1/2 -10 = 1/10 The Intensity of an ultrasand wave is changed by - 9dB . This means that the current intensity is as much as the original level . - adB / 1 1 - 3 -3 - 3 2 * 2 1 2 Co- 1/2 1/2 1/2 2 2 2 The intensity of a signal decreases by it adB. How big is the new intensity compared to the eqoriginal intensity ?8 + 9 d B 3 3 3x 2 x 2X 2X 4 x 2 - 8 stronger The power in a wave is increased to lotimes its original valve . Determine the amount of change in decibels . + 10X + 10 x = 10dBDATE . ( A ) The power in awave is increased to lo times its original vale . Determine the amount of change in decibels CHART +3 = 2x +10 = 10x + LO 10 JB -3 = 1/2 -10 = 1/ 10 . ( 3 ) The Intensity look a signal is reduced by 20dB . How big is the new intensity compared to le 20 dB keyword "reduced" -10 -10 10 x 10 = 100 new = ? ongmal - To 10 10 100 new intensity = 1 100