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What is the corresponding change in level for a factor of 10 change in power?

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What is the corresponding change in level for a factor of 10 change in power?

(a) 100dB

(b) 20dB

(c) 10dB

(d) 0.1dB

The question was asked by my school principal while I was bunking the class.

This intriguing question originated from The Decibel topic in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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Right answer is (c) 10dB

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

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