حللت بعض المسائل ولكن لم تعطيني الناتج الصحيح لادري لماذا ؟؟؟؟وهي المسائل الاتية
How much electromagnetic energy is contained in each cubic meter near the Earth’s surface if the intensity of sunlight under clear skies is 1000 W/m2
2. At a distance of 10 km from a radio transmitter, the amplitude of the E-field is 0.20 volts/meter. What is the total power emitted by the radio transmitter?
5. A light ray is partially reflected and partially refracted at a boundary between two media, the upper one having index of refraction n, the lower one having index of refraction n¢, as shown in the figure. The reflected ray is perpendicular to the refracted ray when
رد مع اقتباس
مواقع النشر (المفضلة)