A change in power from 100 W to 1 W corresponds to approximately ________ decibels.
A) 10
B) 20
C) -10
D) -20

Question

Quizplus · Accepted Answer

The formula for calculating decibels is 10 log (P2/P1), where P1 is the initial power and P2 is the final power.

Using this formula, the change in power can be expressed as:

10 log (1/100) = -20

Therefore, the change in power from 100 W to 1 W corresponds to approximately -20 decibels. The answer is D.

A Change in Power from 100 W to 1 W