Question

= 3.90 x 1026 W). Neglecting any atmospheric absorption, we want to find the rms values of the electric and magnetic fields when the starlight reaches us. (Psun When we look at the North Star (Polaris), we intercept light from a star at a distance of 431 ly and emitting energy at a rate of 2.2 x 103 times that of our Sun KEY IDEAS 1. The rms value Ems of the electric field in light is related to the intensity I of the light via 1 Ems сио 2. Because the source is so far away and emits light with equal intensity in alll directions, the intensity I at any distance r from the source is related to the source's power P^ via Р. I = 4лr? 3. The magnitudes of the electric field and magnetic field of an electromagnetic wave at any instant and at any point in the wave are related by the speed of light c according to = c В

Answer 1

tyms CaccaXidP) Cro Eyms P&CMO V 411 72 Evms 2-2x10(3xlo) x4Txn6 V 4Tx C08X 108M) 1-24x 10v/m -3 24x 10 Emas Bes 3x 108 4.l45x 101T /2 4.145 PT