1 Figure 1 represents a longitudinal wave travelling along a spring. Figure 1 (a) (i) On Figure 1 add a letter C to indicate one region of compression. A longitudinal wave passes through the coils of a spring. (ii) Describe the motion of the coils in the spring. (2) (iii) Which one of these is a longitudinal wave? A radio wave B seismic S wave C surface water wave (1)

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1 Figure 1 represents a longitudinal wave travelling along a spring. Figure 1 (a) (i) On Figure 1 add a letter C to indicate one region of compression. A longitudinal wave passes through the coils of a spring. (ii) Describe the motion of the coils in the spring. (2) (iii) Which one of these is a longitudinal wave? A radio wave B seismic S wave C surface water wave (1)

Answer 1

(a) (i) The letter \( C \) should be added to a region where the spring is most compressed or bunched up. (ii) The coils of the spring move back and forth along the direction of the wave, compressing and expanding as the wave passes through. (iii) D ultrasound wave is a longitudinal wave.

Answer 2

## Step1: The first part of the question asks to identify a region of compression in a longitudinal wave. In a longitudinal wave, regions of compression are where the particles of the medium are closest together. These regions are typically represented by the areas where the wave is most dense or bunched up. ## Step2: The second part of the question asks to describe the motion of the coils in the spring. In a longitudinal wave, the particles of the medium move in a direction parallel to the direction that the wave moves. Therefore, the coils of the spring would move back and forth along the direction of the wave, compressing and expanding as the wave passes through. ## Step3: The third part of the question asks to identify which of the given options is a longitudinal wave. Longitudinal waves are characterized by particle motion being parallel to wave motion. This means, the particles in the medium vibrate back and forth along the path that the wave moves. Sound waves in air (and any fluid medium), waves in a slinky, and seismic P-waves are examples of longitudinal waves. Among the options given, an ultrasound wave is a type of sound wave, and therefore, is a longitudinal wave.

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