26. The speed of sound in air is approximately:
a) 343 m/s
b) 100 m/s
c) 10,000 m/s
d) 1,000,000 m/s
Answer: a) 343 m/s
27. The distance between two consecutive compressions or rarefactions in a sound wave is called its:
a) Amplitude
b) Frequency
c) Wavelength
d) Period
Answer: c) Wavelength
28. The process of sound waves bouncing back after hitting a surface is known as:
a) Reflection
b) Refraction
c) Diffraction
d) Absorption
Answer: a) Reflection
29. The speed of sound waves is fastest in:
a) Solids
b) Liquids
c) Gases
d) Vacuum
Answer: a) Solids
30. The phenomenon of a sound wave being absorbed by a material and converted into heat energy is known as:
a) Reflection
b) Refraction
c) Diffraction
d) Absorption
Answer: d) Absorption
