12. What part of the wave is labelled as A? a. Amplitude b. crest c. trough d. wavelength

13. What part is labelled as B?
a. Amplitude
b. crest
c. trough
d. wavelength


14. Which of the labelled parts is known as the wavelength?
a. A
b. B
d. D
c. C


15. The loudness or softness of a sound refers to:
a. Pitch
b. timbre
c. volume
d. quality


16. What affects the pitch of the sound? It is the of the wave;
a. Amplitude
b.) frequency
c. volume
d. wavelength


17. As the amplitude of the sound wave increases the volume of the sound also increases.
a. false
b.true
c. maybe
d. none of the above​