To measure the distance across a river at night using a sensitive light meter and a meter stick, one can utilize the principles of light intensity and the inverse square law. By measuring the light intensity from the street light with the light meter at various distances along the bank, one can apply the equation I = P / (4πd²) to determine the distance (d) to the light source. This method requires accurate readings of light intensity and careful positioning of the meter stick to ensure precise measurements.
PREREQUISITESPhysics students, educators, and anyone interested in practical applications of light measurement and distance calculation techniques.