Which of the following would not be considered a characteristic of light waves?

• A. They can travel through a vacuum.
• B. They have definite wavelength and frequency.
• C. They require a medium to propagate.
• D. They can exhibit both wave and particle characteristics.

Answer: (C)

Light waves are unique in that they can travel through a vacuum, which means they do not require a medium like sound waves do. This characteristic allows light from the sun to reach Earth through the empty space of the solar system.

Furthermore, light waves have both wavelength and frequency, which are fundamental properties that determine the color and energy of the light. The relationship between wavelength and frequency is described by the equation ( c = \lambda \cdot f ), where ( c ) is the speed of light, ( \lambda ) is the wavelength, and ( f ) is the frequency.

Additionally, light exhibits both wave-like and particle-like properties, a concept known as wave-particle duality. This means that while light can behave as a wave, it can also be emitted or absorbed in discrete packets called photons, demonstrating particle characteristics.

In contrast, the idea that light requires a medium to propagate is inaccurate, as it can travel through the vacuum of space without any medium. Thus, the correct choice highlights a characteristic that does not apply to light waves.