Revision: Sound 13 Sound - Revision Quiz Test your understanding of Sound here: 1 / 5 1) A point oscillator dipping into water in ripple tank has a period of 0.50 s. The resulting wave has a wavelength of 2.0 cm. What is the speed of the wave? 4.0 cm/s 2.0 cm/s 0.25 cm/s 1.0 cm/s 2 / 5 2) Thunder is heard 8.2 s after a lightning flash is seen. Given that the speed of sound in air is 330 m s-1, how far away is the lightning from the observer? 2.7 km 1.4 km 40 km 5.4 km 3 / 5 3) Which of the following statements about sound waves is incorrect? Sound waves travel faster in solids than in liquids. Sound waves with frequencies lower than 20 kHz is known as infrasound. The speed of sound through air is affected by the temperature of the air. Sound waves travel with longitudinal wave motion. 4 / 5 4) A circular disc has 100 holes. It rotates at 300 revolutions per minute and air is blown across the holes. What is the frequency of the sound produced? 300 Hz 500 Hz 20 Hz 180 Hz 5 / 5 5) A pure note is displayed on the screen of a C.R.O. as shown in the diagram below. If the time base setting of the C.R.O. is set to 2.0 ms cm-1, what is the frequency of the note? 20 Hz 5.0 Hz 5.0 kHz 200 Hz Your score is Restart quiz