The highest wave ever recorded in Australia was 24.9m, off Macquarie Island. If the average surfer is 1.8m tall, how many surfers standing on top of one another would it take to reach the top of the wave?Round your answer to the nearest whole number.

Ocean waves approaching the shore can be described as sinusoidal periodic waves with amplitude 4.4 m and wavelength 3.8 m.Two swimmers are in the ocean, with swimmer C 2.4 m further offshore than swimmer D. If at some instant in time swimmer C is at the crest of the wave, how far below swimmer C  will swimmer D be at the same time?Give your answer in metres.

The figure above shows the ocean surface. Which letter indicates Wave Height?Group of answer choicesDCBEA

Betty is sitting on of her surfboard out in the ocean. She is waiting for the perfect wave to come along so she can ride it in to shore. As she waits, she notices that the waves roll by in patterns, or sets. As Betty waits, she counts the number of waves that pass her during a 1-second period; she counts just 1. She estimates that the distance between crests is 6 meters. Betty sees the perfect wave and begins paddling. She pushes herself up, stands on the surfboard and rides the wave all the way in to shore, a distance of about 60 meters. It takes her about 10 seconds to ride the wave in. Use two methods to calculate the speed of the wave based on the information presented. Are they the same? Explain how you got your answers.

22 A transverse water wave is moving along the surface of some water. This causes a ball to movevertically without moving horizontally as it floats upon the surface. At one instant, the ball is at theposition shown.2.4 m0.70 mballdirection ofwave travelNOT TOSCALEThe wave has a frequency of 0.20 Hz and an amplitude of 0.70 m. The distance between a troughand an adjacent peak is 2.4 m.What is the distance travelled by the ball in a time of 20 s?A 5.6 m B 9.6 m C 11.2 m D 19.2 m23 A sound wave travels from left to right across a room. The variation with distance across theroom of the displacement of the air molecules at one instant is shown.At which distance will the air pressure be lowest?displacementdistance from left-handend of roomrightleft0A B C D24 A source emits a sound wave of a single frequency. The Doppler effect causes a differentfrequency of sound to be heard by a stationary observer.What is a requirement for the Doppler effect to occur?A a source that is moving as it produces the sound waveB a source that produces a polarised sound waveC a source that produces a sound wave of changing amplitudeD a source that produces a sound wave of changing frequency

1Which of the following is NOT equal to the wavelength of a wave?The distance from the trough of one wave to the trough beside itThe distance from a point on one wave to the equivalent point on the wave beside itThe frequency of the wave (in Hz) divided by its speed (in m/s)The distance from the peak of one wave to the peak beside it2What is meant by the amplitude of a wave?The number of waves passing a point per secondThe distance from a point on one wave to the equivalent point on the wave beside itThe maximum displacement of a point on a wave from its undisturbed positionThe time taken for one complete wave to pass a point3What is meant by the frequency of a wave?The number of waves that pass a point per secondHow often a wave passes a pointThe total number of waves produced by a sourceThe number of seconds it takes for one complete wave to pass a point4A pianist plays a note which has a frequency of 440 Hz.  Calculate the wavelength of this sound wave produced by the piano if the speed of sound in air is approximately 330 m/s.0.75 m1.33 m (2 d.p.)145,200 m110 m5A wave of wavelength 10 m is travelling at a speed of 100 m/s.  Calculate the period of this wave.0.1 seconds10 seconds1,000 seconds1 second6Brian uses a starter pistol to mark the start of a 100 m sprint.  The sound wave produced by the pistol reflects from a nearby wall, and he hears the echo of the shot 600 ms (milliseconds) after the pistol was fired.  Calculate how far the wall was from Brian.  The speed of sound in air is approximately 330 m/s.99 m198 m1,980 m990 m7A sound wave travels from air into water.  In air, the sound wave travels at a speed of 340 m/s and has a wavelength of 20 m, and in water, it travels at a speed of 1500 m/s.  Calculate the wavelength of the sound wave in water.88.24 m25,500 m4.53 m0.01 m