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Question 50 - HPE6-A85 discussion

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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
Answers
A.
.-1 mW
B.
.01 mw
Answers
B.
.01 mw
C.
10 mW
Answers
C.
10 mW
D.
1mW
Answers
D.
1mW
Suggested 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

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

The dBm is a logarithmic unit of power relative to 1 milliwatt (mW). -20 dBm means that the signal strength is 20 decibels lower than 1 mW. In terms of mW, this is 0.01 mW. Each 10 dB decrease represents a tenfold decrease in power. Therefore, -20 dBm is 102102 or 0.01 mW.

asked 16/09/2024
Aung Zin
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