(i) The intensity of a light pulse travelling along a communication channel decreases exponentia....

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(i) The intensity of a light pulse travelling along a communication channel decreases exponentially with distance x according to the relation I = I0e–αx, where I0 is the intensity at x = 0 and  is the attenuation constant.
Show that the intensity reduces by 75 per cent after a distance of ln 4α.
(ii) Attenuation of a signal can be expressed in decibel (dB) according to the relation dB =10log10II0. 
What is the attenuation in dB/km for an optical fibre in which the intensity falls by 50 per cent over a distance of 50 km? 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live



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