Plot the fine structure energy levels of the ion l (諐 for the principle quantum number n = 3 and n = 2. use the term symbols to denote these levels. (15%) hint: the energy levels of the hydrogen-like atoms are described by 3 川 +1/2 4 (b) it is known that the selection rules of quantum transition are given by how many spectrum lines are there in the allowed transitions in (a)(5%) and how many different frequencies of these transitions would appear? (5%)

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

What is the measure of a change in an objects velocity?

Which of these is not a possible type of energy transformation? a. electrical energy into light energy b. sound energy into nuclear energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy