Agamma ray with an energy of 3.40 × 10-14 joules strikes a photographic plate. we know that planck's constant is 6.63 × 10-34 joule·seconds. what is the frequency of the photon? select one of the options below as your a. 5.13 × 1019 hertz b. 5.60 × 1017 hertz c. 2.45 × 1017 hertz d. 2.45 × 10-12 hertz e. 7.80 × 10-19 hertz

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.