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Waves Test Essay

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Below is an essay on "Waves Test" from Anti Essays, your source for research papers, essays, and term paper examples.

1. Here is some information about ultrasound.
Human ears can detect sounds with frequencies in the range
20 Hz to 20 000 Hz. Frequencies above this range are called
ultrasound.
Short bursts of ultrasound waves can be used to measure the
depth of the sea. The waves are produced by a crystal
vibrating at a very high frequency.

(a) Which of the following frequencies could be ultrasound?
Circle the correct answer.
15 Hz           250 Hz             15 000 Hz               25 000 Hz
(1)

(b) Why can humans not hear ultrasound?
...................................................................................................................................
...................................................................................................................................
(1)

(c) The crystal vibrates at a very high frequency.
Which is the best description of the frequency of vibration?
A The distance the crystal vibrates in a second.
B The number of vibrations of the crystal in a second.
C The time it takes for the crystal to complete one vibration.
Write the correct answer (A, B or C) in the box.
(1)
(Total 3 marks)



2. The diagram shows how two different waves are involved when listening to a radio.


(a) Complete the sentences that compare the radio wave and the sound wave.
(i) The frequency of the radio wave is ................................................... than the frequency of the sound wave.
(1)

(ii) The radio wave is transverse; the sound wave is .............................................
(1)

(b) The graph shows how the position of the loudspeaker cone changes when it is reproducing a sound of frequency 250 Hz.


(i) Which word best describes the movement of the loudspeaker cone?
Circle the word of your choice.
amplification                   gyration                     rotation                   vibration
(1)


(ii) Use the graph to write down the amplitude of the wave motion....

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