Help with these questions (the circled ones might not be right)

B. 9. The graph shows the variation with time for the displacement of a particle in a travelling wave. What are the frequency and amplitude for the oscillation of the particle? 20- 1.5- 1.0- 0.5 Frequency / kHz Amplitude / um displacement / A. 20 0.0- 2 10 m 5 10 15 20 25 30 35 40 B -05- 20 time / 10- s 4 -10- 50 2 -1.5- D. 50 4 -20-A. 2xo B. XO C. A 5. A transverse wave moves through a medium. Relative to the direction of energy transfer through the medium, what are the displacement of the medium and the direction of propagat of the wave? Displacement of medium Direction of propagation of wave A parallel perpendicular B parallel parallel C perpendicular parallel perpendicular perpendicular10. A water wave entering a harbour passes suddenly from deep to shallow water. In deep water, the water? wave has frequency fi and speed vi. In shallow water, the wave has frequency fa and speed vz. Which of the following compares the frequencies and speeds of the wave between deep water and shallow V 1 Frequencies Wave speeds (A B. C. deep water D. shallow water 11. A point source emits sound waves of amplitude A. The sound intensity at a distance d from the source is I. What is the sound intensity at a distance 0.5d from the source when the source emits waves of amplitude 2A? CAR 161 B. 41 C. I D. - I7. A light ray passes from air to water as shown. What is the change in the wavelength of the light wave and the change in the angle the ray makes with the normal to the surface: Wavelength Angle with normal increases increases light B increases decreases ray C. decreases increases air B decreases decreases water 18. Light travelling is a vacuum with a speed centers a glass block with a refractive index n. The speed of light in the glass is A. c B. nc2 C. cn D.n/cwave at K! A. O B. A C. AZ D. 2A 20. What are the changes in speed, frequency, and wavelength of light as it travels from a material of low refractive index to a material of high refractive index? Speed Frequency Wavelength A decreases decreases unchanged B. decreases unchanged unchanged C. unchanged increases decreases D. decreases unchanged decreases boundary between air and diamond. The speed of light in diamond i mile of incidence i of the light is greater than the critical22. A standing wave is formed on a string. P and Q are adjacent antinodes on the wave. Three statements are made by a student: I. The distance between P and Q is half a wavelength. It. P and Q have a phase difference of n rad. Ill. Energy is transferred between P and Q. Which statements are correct? A. land II only B. J and III only C. II and III only D. III and III23. A string is fixed at both ends. P and Q are two particles on the string. P Q The first harmonic standing wave is formed in the string. What is correct about the motion of P and Q? A. P is a node and Q is an antinode. B. P is an antinode and Q is a node. C. P and Q oscillate with the same amplitude. (D. P and Q oscillate with the same frequency. 24. A string fixed at both ends vibrates in the first harmanis ound in the string is 480 inD. F is an antinode and Q is a node. P and Q oscillate with the same amplitude. D. P and Q oscillate with the same frequency. 24. A string fixed at both ends vibrates in the first harmonic with frequency 400 Hz. The speed of sound in the string is 480 m s-1. What is the length of the string? A. 0.42 m B. 0.60 m C. 0.84 m D. 1.2 m 5. A student hi