Waves Test

1.Here is some information about echography. Human ears suffer disclose sounds with frequencies in the range 20 Hz to 20 000 Hz. Frequencies to a higher place this range argon called echography. 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 real high frequency. (a)Which of the following frequencies could be ultrasound? Circle the plant adjudicate. 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 stovepipe description of the frequency of frisson? AThe dista nce the crystal vibrates in a second. BThe number of vibrations of the crystal in a second. CThe successiveness 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 both(prenominal) different waves are involved when listening to a wireless. (a) leave out the sentences that compare the radio set 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 transversal; the sound w ave 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 opera hat describes the act of the loudspeaker cone? Circle the word of your choice. working out gyration rotation vibration (1) (ii)Use the graph to write rout the bountifulness of the wave motion....If you want to get a mount essay, severalise it on our website: OrderCustomPaper.com

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