D. polarization
15. What do you call the change in the direction of light due to the change in speeda
A reflection
B. refraction
C. transmission
16. What is the unit for measuring the intensity or loudness of a sound wave?
A decibel
C. meters per second
B. hertz
D. watts per square meter
17. What term refers to how high or low a note that a listener hears?
A volume
B. energy
C. amplitude
18. What is the common cause of hearing loss in teenagers and young adults?
Cloud noise or music
B. infection or disease
D. aging
D. pitch
A. injury
19. What do you call the process that bats and dolphins use to navigate and locate the
food?
A. their sight
C. infrasound
B. echolocation
D. ultrasound
20. Sound waves with frequencies beyond 20,000 Hz are called
A ultrasound
C. sonar
B. infrasound
D. echolocation
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Answer:
15.B
16.A
17.A
18.B
19.B
20.A
Explanation:
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