11. Which of the following waves do not require a medium to propagate?
a) Longitudinal waves
b) Transverse waves
c) Both longitudinal and transverse waves
d) None of the above
Answer: b) Transverse waves
12. The speed of a wave is equal to the product of its wavelength and frequency. True or False?
Answer: True
13. The energy of a wave is directly proportional to its amplitude. True or False?
Answer: True
14. The process of a wave bouncing off a surface is called:
a) Reflection
b) Refraction
c) Diffraction
d) Interference
Answer: a) Reflection
15. The bending of waves around obstacles or through openings is called:
a) Reflection
b) Refraction
c) Diffraction
d) Interference
Answer: c) Diffraction
