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Question: The intensity of a light pulse travelling along a communication channel decreases exponentially with...

The intensity of a light pulse travelling along a communication channel decreases exponentially with distance x according to the relation I = Ioe-ax , where I0 is the intensity at x = 0 and α\alpha is the attenuation constant. The percentage decrease in intensity after a distance of (In4α)\left( \frac{In4}{\alpha} \right)is

A

70%

B

75%

C

80%

D

85%

Answer

75%

Explanation

Solution

: 75%