9. PG represents the boundary between regions I and II, having different depths, in a ripple tank containing water. Wave fronts are shown crossing the boundary. II Which of the following correctly describes the waves in region II as compared to those in region I? NOTE: v represents wave velocity it represents wavelength f represents frequency T represents period (a) In region ll, f is the same, v is less, and A is less than in region I. (b) In region ll, f is the same, v is greater, and A is greater than in region 1. (c) In region ll, f is the same, v is greater. and A is less than in region I. (d) In region ll, v is the same, T is less, and A is less than in region I. (e) In region II, V is the same, T is greater, and A is less than in region I. When two point sources placed a fixed distance apart vibrate in phase, nodal lines are produced. Which one of the following statements concerning these lines is incorrect? (a) Energy is transmitted away from the sources between the nodal lines. (b) At large distances from the sources, nodal lines have a uniform separation of half a wavelength. (c) There is a constant path difference from the point sources to any point on a given nodal line. (d) Destructive interference occurs on nodal lines. (e) All nodal lines are hyperbolic. A pendulum vibrates 40 times in 20 s. the frequency of the pendulum is (a) 0.50 Hz (b) 0.50 s (c) 2.0 s (d) 2.0 Hz (e) 20 Hz 10. Which of the following is not a property of light? (a) It travels faster than sound. (b) It travels faster in air than in a vacuum. (c) It travels in a straight line. (d) It can be bent by refraction. (e) It is a form of energy. 11. A 200 g baseball travelling at 40 mils is hit by a bat. It travels straight back at the pitcher at a speed of 50 mis. If the bat is in contact with the ball for 10 ms, what average force does it exert on the ball? (3)2.0x102N (b) 9.0x102N (c)1.8x1{}3N (d)2.0x1D5N (e)1.8x105N 12. Monochromatic light coming from the left passes through a slit S and then falls on a metal sheet with two slits B and C as shown below. The slits are the same width. The light then falls on a screen, giving rise to characteristic intensity patterns centred at P. B p. 0 mm C -5 .0 m -10.0 m Which of the intensity patterns is characteristic of this arrangement? (A) (B) Intensity Interest Distance (em) Distance (em) (c) (D) Intensity Interalty Distance (er) Distance (cm) (E) Intently Distance (em)