Sound Waves

11. Which of the following materials is the best absorber of sound waves?

a) Glass

b) Rubber

c) Metal

d) Foam

12. The unit decibel (dB) is used to measure:

a) Frequency

b) Amplitude

c) Wavelength

d) Speed

13. Which of the following is not a characteristic of a sound wave?

a) Reflection

b) Refraction

c) Diffraction

d) Absorption

14. Sound waves cannot travel through:

a) Vacuum

b) Air

c) Water

d) Solids

15. The phenomenon of sound waves bouncing off a surface is known as:

a) Reflection

b) Refraction

c) Diffraction

d) Absorption