Question

which of the following phenomena provide evidence for the wave theory of light?
a diffraction
b wavelength theory
c the photoelectric effect
d color theory
e none of the above

Explanation:

To determine which phenomenon supports the wave theory of light:

• Option a (Diffraction): Diffraction is the bending/spreading of waves around obstacles, a characteristic of wave behavior. Light diffraction (e.g., single - slit diffraction) is strong evidence for light as a wave.
• Option b (Wavelength theory): This is not a recognized phenomenon or theory that provides evidence for light’s wave nature.
• Option c (Photoelectric effect): This supports the particle (photon) theory of light, not the wave theory.
• Option d (Color Theory): Color theory deals with perception/mixture of colors, not evidence for light’s wave nature.
• Option e: Incorrect, as option a is valid.

Answer:

a. Diffraction