Which of the following is an example of potential energy?
A. A pottery wheel spinning with the clay on it spinning too
B. A rubber band is stretched out
C. Two children running
D A train moving across the railroad track

Asample of a gaseous substance changes into a liquid

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.