If the approximate energy of a photon present in an x-ray is 8.0 × 10-15 joules, what's the frequency of the x-ray? given: planck's constant is 6.63 × 10-34 joule·seconds.
(a)1.2 × 1014 hertz
(b)1.2 × 1019 hertz
(c)8.2 × 1018 hertz
(d)8.3 × 1019 hertz

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.