Question

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 $\alpha$ is the attenuation constant. The percentage decrease in intensity after a distance of $\left( \frac{In4}{\alpha} \right)$is

• A. 70%
• B. 75%
• C. 80%
• D. 85%

Answer 1

Answer: (B)

75%

Answer 2

: 75%