16. What happens to sound waves from an object as it moves toward you?
A. The pitch gets lower because of an increase in frequency.
B. The pitch gets higher because of an increase in wavelength.
C. The pitch gets higher because of an increase in frequency.
D. The pitch gets lower because of an increase in wavelength.
17. Which combination of frequencies would produce the lowest beat frequency?
A. 10 Hz and 15 Hz
B. 10 Hz and 20 Hz
C. 500 Hz and 501 Hz
D. 500 Hz and 600 Hz
18. A sound has a higher pitch than a bell. Which quantity must also be higher in this sound than in the bell?
A. wavelength
B. speed
C. frequency
D. amplitude
19. Which statement regarding sound traveling in air is correct?
A. A loud sound travels faster than a quiet sound.
B. The frequency of a sound does not affect the speed at which it travels.
C. As the wavelength increases, the frequency also increases.
D. A wave with a shorter wavelength is always faster than one with a longer wavelength.
16. C. The pitch gets higher because of an increase in frequency.
17. A. 10 Hz and 15 Hz
18. C. frequency
19. B. The frequency of a sound does not affect the speed at which it travels.