Question

Sound and light waves, both ______.

• A. have the same speed
• B. travel through vacuum
• C. obey the laws of reflection
• D. are forms of energy

Answer 1

Answer: (C), (D)

The correct options are
C obey the laws of reflection
D are forms of energy

Both sound and light are forms of energy. Since sound waves are mechanical waves, they require a medium to propagate. Light waves do not require a medium to travel. Laws of reflection are applicable for both light and sound waves.
Speed of light and sound in air are $3\times {10}^{8}m{s}^{-1}$ and $340m{s}^{-1}$ respectively.