Diffraction patterns are due to interference. Diffraction is the process of bending of light when it reaches the obstacle. A diffraction pattern is formed at the screen in which there are some bright and dark band.
Diffraction can be done using single slit, diffraction grating and double silt. Hence, the correct option is (a) "interference ".
Diffraction patterns are due to interference<span>. Diffraction is a phenomena which occurs when a wave encounters an obstacle. It is the bending of light around the corners if the obstacle.</span>
The term you need to know is equilibrium. Technically it means that heat gained = heat lost. Normally in beginning chemistry classes the evidence for this condition is a stable temperature.
