Which layer of gas molecules in the atmosphere is bombarded with rays from the sun

If you touch a hot light bulb and get burned, that is an example of a. radiation b. convection c. conduction

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?