11 A wave of amplitude A has an intensity of 4.0 W moz. What is the amplitude of a wave of the same frequency that has an intensity of 64 W ma? Select one alternative: O 1/2A O 3A 0 5A OVA 0 4A Recat Maximum marks: 112 The diagram shows a wire with a vibrator attached at one end. The other end is attached to a fixed point, When a standing wave with one loop is produced, the frequency of the vibrator is f. Fixed end Vibrator Which frequency should be used to produce the 5h harmonic? Select one alternative: Q 20F 04 Q 1/2f 0 51 O 2/3f Reset Maximum marks: 110 An equation describing a wave is given by y (m) = 0.8sin(6.4t - 5.8x) Where t is in seconds and x is in metres. What is the speed of the wave? Select one alternative: 0-1.1 m/s 01.1 m/s 0-1.5 m/s 0 1.5 m/s O 0.8 m/s Reset Maximum marks: 1