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What is the corresponding change in level for a factor of 10 change in amplitude?(a) 100dB(b) 20dB(c) 10dB(d) 0.1dBI got this question in exam.My query is from The Decibel in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer»

The CORRECT OPTION is (b) 20dB

The explanation is: A decibel is TEN times the value of power in its logarithm in base 10. Therefore a 20dB change is RESULTANT of a change in amplitude by a factor of 10. However, when calculating in terms of power the change is due to a factor on 10.



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