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.