Revision: Sound 13 Sound - Revision Quiz Test your understanding of Sound here: 1 / 5 1) A musical note of wavelength λ has a velocity of v and a frequency of ƒ in air. What will be the frequency and velocity of another musical note of wavelength 2λ in air? frequency: ƒ/2 velocity: v frequency: 2ƒ velocity: v frequency: 2ƒ velocity: 2v frequency: ƒ/2 velocity: 2v 2 / 5 2) The following shows the displacement-distance graph for a wave. What is the wavelength of the wave? 0.33 m 0.29 m 3.5 m 0.30 m 3 / 5 3) In an experiment to measure the speed of sound in air, a boy stands 40 m from a wall and bangs two pieces of wood together. At the instant he hears the echo, he bangs them together again. He does this 50 times. The time taken for 50 bangs is 12 seconds. Which calculation gives the speed of sound in air? (40 × 2 × 12)/50 12/(40 × 50) (40 × 2 × 50)/12 (40 × 50)/12 4 / 5 4) During a storm, a man hears the thunder 3.0 s after he observed the lightning. If the speed of sound is estimated to be 340 m/s, what is the approximate distance between the man and the storm? 0.11 km 0.90 km 0.34 km 1.0 km 5 / 5 5) A girl stands in front of a cliff. She claps her hands so that every clap coincides with the echo of the previous clap. She discovers that she claps her hands once every 0.8 s. The velocity of the sound in air is 340 m/s. What is the separation between the cliff and the girl? 136 m 425 m 850 m 272 m Your score is Restart quiz