A perfect (no loss) coaxial cable has 7 dB...

Question 1 / 270704SssYwjcUAFKPBfx771h

Question 1 of 270704SssYwjcUAFKPBfx771h

A perfect (no loss) coaxial cable has 7 dB of reflected power when the input is 5 watts. What is the output of the transmission line?

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Question 1 of 27070

A perfect (no loss) coaxial cable has 7 dB of reflected power when the input is 5 watts. What is the output of the transmission line?

🔍 Key Concepts

• Decibel (dB) definition for power – how dB relates input power to reflected power • Relationship between incident, reflected, and transmitted power in a lossless (perfect) line • Meaning of no loss / perfect transmission line in terms of power conservation

💭 Think About

• Start by converting 7 dB of reflected power into a power ratio. What fraction of the input power is being reflected? • Once you know the reflected power in watts, how does conservation of energy apply in a perfect (no loss) line? Where does the remaining power go? • Compare the possible transmitted (output) powers with your calculated input minus reflected power. Which option matches?

✅ Before You Answer

• Be sure you are using the correct dB formula for power: dB relates to a ratio, not directly to watts. • Double-check your logarithm direction: is 7 dB telling you the reflected power is higher or lower than the incident power? • Confirm that in a no-loss line, the sum of reflected power and transmitted (output) power must equal the input power.

Question 1 of 27070

A perfect (no loss) coaxial cable has 7 dB of reflected power when the input is 5 watts. What is the output of the transmission line?

1 watt.

1.25 watts.

2.5 watts.

5 watts.