5. What is the unit used in measuring the frequency of a wave?
A. Meters
C. Meters per second
B. Hertz
D. Hertz per second
6. What is sound energy?
A. It is moving electrons.
B. It is plain kinetic energy.
C. It is energy that travels in waves through vibrating matter.
D. It is energy that travels in waves like light from the stars.
7. Mechanical waves that are created through areas of compression and rarefactions are called_________________ waves.
A. diffracted
C. longitudinal
B. electrical
D. transverse
8. Which statement correctly compares wave A and B?
A. Wave A has greater amplitude than wave B.
B. Wave B has greater amplitude than wave A.
C. Wave A has greater wavelength than wave B.
D. Wave B has greater wavelength than wave A.
9. If a wave has a frequency of 10 Hz and a wavelength of 100 m, what is its velocity?
A. 10 m/s
C. 100 m/s
B. 20 m/s
D. 1000 m/s
10. A boy felt like the sound level of in his room was too high. He turned the knob of his music system to make it quieter. What physical property of the sound changed and how did it change?
A. The amplitude decreased
B. The amplitude increased
C. The frequency decreased
D. The frequency increased ​