Henri becquerels original hypothesis was that fluorescent minerals became excited by solar energy and gave off x-rays however, after he discovered uranium mineral emitted there own radiation without the of solar energy he abandoned his hypothesis why did becquerel abandon his first hypothesis.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final