31. The pitch of a sound is determined by its:
a) Frequency
b) Amplitude
c) Wavelength
d) Speed
Answer: a) Frequency
32. The lowest point of a sound wave is called its:
a) Crest
b) Trough
c) Amplitude
d) Wavelength
Answer: b) Trough
33. The process of sound waves bending around obstacles or spreading out after passing through an opening is known as:
a) Reflection
b) Refraction
c) Diffraction
d) Absorption
Answer: c) Diffraction
34. The process of sound waves bending as they pass from one medium to another is known as:
a) Reflection
b) Refraction
c) Diffraction
d) Absorption
Answer: b) Refraction
35. The measure of the amount of energy carried by a sound wave is known as its:
a) Frequency
b) Amplitude
c) Wavelength
d) Period
Answer: b) Amplitude
