The photoelectric effect is the phenomenon in which electrons are ejected from the surface of a material when it is exposed to light. This effect cannot be explained by the wave nature of light. Instead, it provides strong evidence for the particle nature of light.
On the other hand, phenomena such as reflection, diffraction, interference, and polarization are well explained by the wave nature of light.
Let $ P_n = \alpha^n + \beta^n $, $ n \in \mathbb{N} $. If $ P_{10} = 123,\ P_9 = 76,\ P_8 = 47 $ and $ P_1 = 1 $, then the quadratic equation having roots $ \alpha $ and $ \frac{1}{\beta} $ is: