Matching: 1. A high note a nd a low note dif fer in _______. 2. A sound wave which registers at a noise level of 150 decibels has a greater ______than a sound wave of 60 decibels. 3. The ____ of a wave is determined by measuring the distance between two wave crests. 4. The lowest point of a transverse wave is called its _________. a. trough b. crest c. amplitude d. wavelength e. frequency Matching: 5. When a sound wave bounces off a barrier, it is ______ed. 6. The doppler effect describes the sudden drop in sound ______ as a race car passes by your seat at the Indy 500. 7. A sound wave is an example of a(n) _________ wave. 8. Ocean waves turn towa rds shore as they move into sha llow water. 9. New technology is being used to reduce sound levels in highly automated facto ries. Computers are used to produce a sound wave which exactly matches the frequency and amplitude of the sound coming from the machines. However, the computer generated wave is out of phase with the machine's sound wave (i.e. the crests of the computer generated wave match the trough of the machine's wave). As a result the machines seem very quiet. This combining effect is called _________. a. ref lec t b. con str uct ive int erf ere nce c. tra nsv erse d. lon git udi nal e. pitch f. destructive interference g. refraction Multiple choice: 10 . When a longitudinal wave travels through matter, the particles of matter ____. a. d o no t move at al l b. move back a nd f or th b ut a re n ot c ar ri ed a long wit h t he wave c. move back and forth and are carried along with the wave d. spread farther and farther apart like an expanding balloon 11. The greater the number of compressions that arrive per second, the smaller is the _ of a sound wave. a. amplitude b. wavelength c. frequency d. speed 12. A hand-made flute produces a fundamental pitch of 480 Hz . The second harmonic for this flute would have a frequency of __ _ Hz. a. 880 b. 0 c. 220 d. 44 e. 960 Hz 13. The speed of sound is approximately 330 m/s. A jet plane flying at 825 m/s would be travelling at a speed of Mach _____. a. 1.5 b. 2 c. 2.5 d. 3 e. 3.5 14. When you play a single note on an instrument, the overtones that are produced combine with the fundamental frequency to ___________. a. form a musical scale b. give the instrument an unique quality c. produce beats which indicate when the instrument is tuned d. generate an interference pattern which causes lower intensity sound Matching: 15. A screami ng Tweety -bird 16. Darth Va der whisper ing 17. Tiny bells tinkling gent ly 18. A loud fog horn. a. high amplitude sound wave, low frequency b. high noise level, high pitch c. qui eter sound, high note d. low sound inte nsity, deep note Multiple choice: 19. Which of the following materials conducts sound the best? a. cold air b. water c. vacuum d. glass e. warm air20. The fundamental frequency of a guitar string is an A note of 90 Hz. The next harmonious A note (played in the next higheroctav e) will have a freq uency of ____. a. 140 Hz b. 45 Hz c. 180 Hz d. 130 Hz 21. Damage to your hearing begins at volumes as low as ____? a. 90 db b. 120 db c. 60 db d. 10 db e. 140db 22. A blind person can tell when an ambulance is speeding at him by hearing ____. a. decreasing volume, increasing pitch b. decreasing pitch, increasing volume c. decr easing pi tch and volume d. increasing pitch and volume 23. The quality of a musical instrument's sound is a combination of ________ produced in addition to the fundamental frequency being produced by the instrument. a. undertones b. undertow c. overtones d. harmonic balance 24. An earthquake wave has a frequency of 20 Hz and a wavelength of 50 Km. How fast is the wave? a. 100 Km/s b. .4 Km/hr c. 2.6 Km/s d. 625 mi/s e. 1000 m/s f. 865 mi/s 25. The wake of a boat is movin g at 3 m/s. The waves are 1.5 m apa rt. What is the freque ncy? a. 2 Hz b. 4.5 Hz c. 20 m/s d. 4.5 m/s
