Question

Which one among the following shows particle nature of light?

• A. photo electric effect
• B. interference
• C. refraction
• D. polarization.

Answer 1

The Correct Option is A

To determine which phenomenon among the given options demonstrates the particle nature of light, we need to understand the nature of each effect:

1. Photoelectric Effect: The photoelectric effect involves the emission of electrons from a material when light is shone on it. This effect provides strong evidence for the particle nature of light since it can be explained by photons, which are particles of light, transferring energy to the electrons. The observation that increasing the light's intensity (while keeping frequency constant) increases the number of emitted electrons but not their energy supports the concept of quantized energy packets, or photons.
2. Interference: Interference is a phenomenon that occurs when two waves superpose to form a resultant wave of greater, lower, or the same amplitude. This effect is characteristic of wave nature, not particles, as it relies on the superposition principle, which is applicable to waves like light waves.
3. Refraction: Refraction refers to the bending of light as it passes from one medium to another, which changes its speed. This phenomenon is associated with the wave nature of light since it involves the change in wave velocity between different media.
4. Polarization: Polarization is the orientation of the vibrations of a transverse wave, such as light. Light waves can be restricted to oscillate in particular directions. This is also a property of waves rather than particles.

Given the explanations above, the photoelectric effect compellingly demonstrates the particle nature of light because it relies on the interaction of discrete energy packets or photons with the electrons in a material. Each photon transfers its energy to a single electron, a concept that is fundamental to quantum physics.