How can an electron in an atom lose energy to go from a higher energy level to a lower energy level? select one: a. it exchanges gravitational potential energy for kinetic energy. b. it loses gravitational potential energy. c. it releases a photon equal in energy to its own energy drop. d. it absorbs a photon equal in energy to its own energy drop. e. it loses kinetic energy?

Need in all of themmm only answer if you know plsssss

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?