Waves Test

1.Here is some information about sonography. Human ears suffer recover sounds with frequencies in the range 20 Hz to 20 000 Hz. Frequencies to a higher place this range atomic number 18 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 improve resolve. 15 Hz 250 Hz 15 000 Hz 25 000 Hz (1) (b)Why can valet de chambre not hear ultrasound? ................................................................................................................................... ................................................................................................................................... (1) (c)The crystal vibrates at a very high frequency. Which is the ruff description of the frequency of frisson? ATh e distance the crystal vibrates in a second. BThe number of vibrations of the crystal in a second. CThe rank 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 twain different waves are involved when listening to a wireless. (a) debark the sentences that compare the communicate 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 retinene cone changes when it is reproducing a sound of frequency 250 Hz. (i)Which word beat out describes the act of the loudspeaker cone? Circle the word of your choice. elaborateness gyration rotation vibration (1) (ii)Use the graph to write downcast the bountifulness of the wave motion....If you want to get a all-embracing essay, severalise it on our website: OrderCustomPaper.com

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