If wavelength of K alpha X rays from copper is 1.337×10-10 m energy difference between 2 levels from which they transition is:
A.90.3keV
B.9.03keV
C.8.03keV

Fill in the blank. the number of each type of element in the compound (other than 1) is represented by a small number to the right of the element symbol.

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?