What idea did Bohr introduce to atomic models? a. Electrons travel in fixed orbits.
b. Energy levels in an atom are quantized.
c. Electrons have wave properties.
d. Electrons are found in electron clouds.

Friction removes energy from objects in motion. which statement best describes how this works? a) friction transforms ke into thermal energy b) friction transfers thermal energy to ke c) friction transforms te into pe d) friction transforms pe into ke e) friction transfers ke into pe