An electron is trapped in an infinite square-well potential of width 0.70 nm. if the electron is initially in the n=4state, what are the various photon energies that can be emitted as the electrons jump to the ground state?

(01.02 mc) nicole pushes her bike up a hill. overhead, the sun exerts a gravitational force on earth. which statement is true about the bike and earth? they both experience contact forces. they both experience non-contact forces. the bike experiences a non-contact force and earth experiences a contact force. the bike experiences a contact force and earth experiences a non-contact force. they both experience non-contact forces.

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

Where do magnetic lines of force enter earth?