To find the distance over which a signal can be seen clearly in foggy conditions
PHYSICS · Subjective · CBSE · Physics · Units and Measurements · Units and Measurements
Problem
To find the distance d over which a signal can be seen clearly in foggy conditions, a railways-engineer uses dimensions and assumes that the distance depends on the mass density ρ of the fog, intensity (power/area) S of the light from the signal and its frequency f . The engineer finds that d is proportional to S1/n . The value of n is [Adv. 2014]