hw 1

The Nature of Sound Waves Read from Lesson 1 of the Sound and Music chapter at The Physics Classroom: http://www.physicsclassroom.com/Class/sound/ul1l1a.html http://www.physicsclassroom.com/Class/sound/u1111b.html http://www.physicsclassroom.com/Class/sound/ul1l1c.html MOP Connection: Sound and Music: sublevel 1 TRUE or FALSE: Identify the following statements as being either true (T) or false (F). 1. Sound waves are longitudinal waves. 2. As the teacher talks, students hear the voice because particles of air move from the mouth of the teacher to the ear of the student. Sound waves are mechanical waves. All sound waves are produced by a vibrating object. s A sound wave does not consist of crests and troughs. 6. Macis talking to Kate. The dot at A represents a particle of air. Describe the motion that this particle A e must undergo in order for Kate to hear Mac. Then O erP show the mation by placing arrows on the diagram. Keep ceoll ding Witk nex - PQr-hL |-e/ o mean of dwove oy Havel v IKake Alloy en Yy o SUad-wWove o tra 7. Tosh is holding one end of a slinky; the opposite end is attached to a wall. Tosh wishes to produce a longitudinal wave in the slinky. Describe how Tosh must move his hand in order to & produce a longitudinal wave. Then place arrows on the diagram™ ——— to show the way in which Tosh must move his hand. Pu (1 ba(/R < ,Q.,- H\ P arallel Jo Sn)uxbL-r 8. Asound wave is moving through air. The diagram below represents a snapshot of the air particles at a given instant in time. Several regions are labeled with a letter. Use the letters to identify the compressions and rarefactions. . .'-.'l" .'-.' R . .' e . "l’ .'-.'l" v . TS PR A B C D E F 66 H I ]J K Compressions: A[, C. £ E,, ()‘/ I,, E Rarefactions: 6, D; F, Hi 3 9. Ascience fiction film depicts inhabitants of one spaceship (in outer space) hear the sound of a nearby spaceship as it zooms past at high speeds. Critique the physics of this film., Cant hear Sound 1n space B¢ no medum © The Physics Classroom, 2009 (p a\9¢ l) PAGE 20