What does -20 dBm correspond to?

When measuring signal strength, dBm is commonly used and 0 dBm corresponds to 1 mW power.

What does -20 dBm correspond to?
A . .-1 mW
B . .01 mw
C . 10 mW
D . 1mW

View Answer

Answer: B

Explanation:

dBm is a unit of power that measures the ratio of a given power level to 1 mW. The formula to convert dBm to mW is: P(mW) = 1mW * 10^(P(dBm)/10). Therefore, -20 dBm corresponds to 0.01 mW, as follows: P(mW) = 1mW * 10^(-20/10) = 0.01 mW

References: https://www.rapidtables.com/convert/power/dBm_to_mW.html