Please help me! I am struggling in Physics right now as it is my weakest subject. This unit is really tough on me. I need all the help I can get. Please include step by step instructions/details so I can actually understand what is going on in the question.

***This is the Atomic Physics Unit of Physics 30***

***Please only do Question 3 and 4***

3. A free electron collides with an electron that is in the X energy state. As a result, the electron in the X energy state undergoes a transition to the Z energy state. Calculate the minimum velocity of the free electron necessary to cause this transition. ( /2) 4. A photon that has a wavelength of 4.20 x 107 m is absorbed by an atom, causing an electron to undergo a transition to a higher energy level. Determine the difference in energy between the energy levels associated with the transition. ( /1) 5. Our understanding of nature advances because of experimental results and the discovery of new phenomena. Discuss how this idea applies to our developing understanding of the atom. (/5) exr- tree. * 100% 1. 30 V - / theo. responding