An electron is trapped in a one‑dimensional box that is 476 nm wide. Initially, it is in the n = 4 energy level but, after a photon is absorbed, the electron is in the n = 8 energy level. What was the wavelength of the absorbed photon?

True or false: the revolution of the earth creates day and night as it rotates around the sun

Abicycle slows down when the rider applies the brakes. what type of energy transformation is involved in this example? a. kinetic energy into heat energy b. heat energy into potential energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy

The mass of a bowling ball is 10 kg and the mass of a ping pong ball is 0.015 kg. if the two objects are 5 meters apart, what is the gravitational force ?