일반물리학 2 — Electromagnetic Waves: Problem 64

64 The average intensity of the solar radiation that strikes normally on a surface just outside Earth’s atmosphere is \(1.4 \text{ kW/m}^2\). (a) What radiation pressure \(p_r\) is exerted on this surface, assuming complete absorption? (b) For comparison, find the ratio of \(p_r\) to Earth’s sea-level atmospheric pressure, which is \(1.0 \times 10^5 \text{ Pa}\).