If the intensity of radiation from the Sun is 1.4 kW/m² at a distance of 150 × 10⁶ km, at what distance is the intensity 5.6 kW/m²? A) 300 × 10⁶ km B) 100 × 10⁶ km C) 75 × 10⁶ km D) 38 × 10⁶ km E) less than 30 × 10⁶ km

Question

Quizplus · Accepted Answer

The intensity of radiation is inversely proportional to the square of the distance. If the intensity increases by a factor of 4 (from 1.4 to 5.6 kW/m²), the distance must decrease by a factor of 2, so 150 × 10⁶ km / 2 = 75 × 10⁶ km.

If the Intensity of Radiation from the Sun Is 1