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Paper 2 H - SAMPLE SET 1 Q16

16) A crowd makes a Mexican wave.
A Mexican wave starts with people lifting and lowering their arms. 
Picture
The Mexican wave continues by people, next to them, lifting and lowering their arms.

(a) Why is a Mexican wave an example of a transverse wave? [1]

(b) In the classroom a teacher demonstrates waves using a rope.
Look at the diagram of the wave.
Picture
(i) The frequency of the wave is 2 Hz.
What does this statement mean? [2]

(ii) How many seconds will it take this wave to travel 12 m?
Show your working. [3]
​
answer: ………………………… seconds
​
(c) Ultrasound scans are used to produce images of tissues inside the body.
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​Ultrasound waves are emitted.
They reflect from layers of tissue inside the body.
Explain how the reflections are used to produce an image of the tissues. [3]

(d) Ultrasound and X rays are used to scan patients in hospitals.
​Complete the table to show a medical use, benefits and risk of using these waves to scan patients. [3]
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​​(​Total for Question 16 = 12 marks)
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