The waves in a ripple tank are moving toward a barrier gap that is 1/2 the wavelength. a and b are equidistant from the gap. select the correct statements about the diffraction that occurs. 1. both a and b will encounter waves. 2. only a will encounter waves. 3. only b will encounter waves. 4. waves will reach b more quickly than a. 5. waves will reach a more quickly than b. 6. waves will reach a and b at the same time.

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.