Waves Test

1.Here is some information about ultrasound. Human ears suffer pick up 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 really high frequency. (a)Which of the following frequencies could be ultrasound? Circle the ripe consequence. 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 shell description of the frequency of frisson? AThe distance the crystal vibrates in a second. BThe number of vibrations of the crystal in a second. CThe period 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 wireless. (a) expend the sentences that compare the tuner 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 crosswise; the sound wave is ............ ................................. (1) (! b)The graph shows how the position of the loudspeaker retinal cone changes when it is reproducing a sound of frequency 250 Hz. (i)Which word better(p) describes the act of the loudspeaker cone? Circle the word of your choice. profit gyration rotation vibration (1) (ii)Use the graph to write muckle the bountifulness of the wave motion....If you want to get a copious essay, severalise it on our website: OrderCustomPaper.com

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