Question

The electrons with small velocities were emitted, if certain metals,

• A. are irradiated by ultra violet rays.
• B. heated to high temperatures.
• C. Both $\left(a\right)$ and $\left(b\right)$
• D. Neither $\left(a\right)$ nor $\left(b\right)$

Answer 1

The correct option is C Both $\left(a\right)$ and $\left(b\right)$

Both irradiation and heating to high temperature helps electrons to jump out of the metal surface.

Hence, $\left(C\right)$ is the correct answer.

$$\begin{array}{c}\text{Why this Question?}\\ \text{This question tests ways to have photo electric effect knocking out electrons of the surface (metal)}\end{array}$$