CAIE A-Level Physics A2 M 5 A Level Radi…garithms

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Optic fibres are used for the transmission of data.

The attenuation per unit length of the signal in the fibre is $0.40 \mathrm{~dB} \mathrm{~km}^{-1}$ . The input power is 1.5 mW and the output power is 0.060 mW .

Calculate the length of the fibre.
length = km

attenuation $=10 \log \left(\mathrm{P}_{2} / \mathrm{P}_{1}\right)$ $0.40 \times L=10 \log (1.5 / 0.06)$ $0.40 \times L=13.979$ $L=35 \mathrm{~km}$

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CAIE A-Level Physics A2 M 5 A Level Radians Exponentials and Logarithms Topic Practice

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