1. The problem statement, all variables and given/known data 3. The classical radius of an electron is 2.82 x 10^-15 m. If a material is radiated with sunlight with an intensity of 500W/m^2, calculate using classical arguments the time required for an electron to gain an energy of 1eV. How does this result compare with electron emission in the photo-electric effect? 2. Relevant equations surface area of a sphere = 4 (pi) r^2 1 electron volt = 1.602 x 10^-19 V 3. The attempt at a solution surface area of hemispheric electron (assuming the light falls on one side of the material) = 2 (pi) r^2 = 5.00 x 10^-29 m^2 power of light falling on electron = 500 x ( 5.00 x 10^-29 ) = 2.50 x 10^-26 W time taken = ( 2.50 x 10^-26 ) / ( 1.602 x 10^-19 ) = 1.56 x 10^-7 s = 156 ns in the photo-electric effect, electrons are emitted instaneously, at times much less than 156 ns. 4. The thoughts is it okay to use the hemisphere instead of the whole sphere as a model of the area where the light falls on the electron? after all im pretty unsure of how the classical theory looks at the electron in a material.