In niels bohr’s model of the atom, electrons move (1 point)like balls rolling down a hill.
like planets orbiting the sun.
like popcorn in a popcorn popper.
like beach balls on water waves.

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

What kind of waves require a medium to travel? question 6 options: light waves mechanical waves all waves need a medium to travel electromagnetic waves

Why do atoms emit energy of only specific wavelengths