Sound Waves

36. The speed of sound waves is slower in:

a) Solids

b) Liquids

c) Gases

d) Vacuum

37. Which of the following is not a method of noise control?

a) Soundproofing

b) White noise

c) Absorption

d) Diffusion

38. The process of sound waves bouncing off a surface and returning to the source is known as:

a) Reflection

b) Refraction

c) Diffraction

d) Absorption

39. The unit used to measure the intensity of sound is the:

a) Hertz

b) Decibel

c) Meter

d) Newton

40. The process of sound waves bending around objects or spreading out as they pass through an opening is known as:

a) Reflection

b) Refraction

c) Diffraction

d) Absorption