If the threshold energy for the photoelectric emission of an electron from a metal is 3 x 10-15 J, what will happen when a photon with 5 x 10-15 ) hits the surface of the metal? A A photon with 2 x 10-15 J of energy will be produced. B Nothing will happen. Photons are not capable releasing electrons from a metal surface. C An electron will be ejected with 2 x 10-15 ) in excess kinetic energy. D Nothing will happen. A photon must have exactly the right amount of energy for an electron to be released.

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

No copying 15 pts how does a free-body diagram tell you about the net force on an object?

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