6. Kittel, Ch4-15, Angular distribution of radiant energy flux. (a) Show that thespectral density of radiant energy flux that arrives in the solid angle discu cos.d/47, where is the angle the normal to the unit area makes with theincident ray, and u is the energy density per unit frequency range. (b) Show that thesum of this quantity over all incident rays is4cu

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6. Kittel, Ch4-15, Angular distribution of radiant energy flux. (a) Show that the spectral density of radiant energy flux that arrives in the solid angle dis cu cos.d/4, where is the angle the normal to the unit area makes with the си incident ray, and u is the energy density per unit frequency range. (b) Show that the sum of this quantity over all incident rays is ¹ - cua 4

6. Kittel, Ch4-15, Angular distribution of radiant energy flux. (a) Show that the spectral density of radiant energy flux that arrives in the solid angle dis cu cos.d/4, where is the angle the normal to the unit area makes with the си incident ray, and u is the energy density per unit frequency range. (b) Show that the sum of this quantity over all incident rays is ¹ - cua 4