In the visible spectrum,which color,violet or red,undergoes greater refraction? Why?

What is interference in the context of electromagnetic radiation?

In which type of radiation do the mass number and atomic number remain unchanged?

The frequency of a wave of light is $12 \times 10^{14} \ s^{-1}$. The wave number associated with this light is

The radiation with maximum frequency is

Which of the following statements is correct about the photoelectric effect?
$1$. The number of electrons ejected from a metal surface is inversely proportional to the intensity of light.
$2$. Below the threshold frequency,the photoelectric effect can be observed.
$3$. At a frequency higher than the threshold frequency,the ejected electrons have a certain kinetic energy.
$4$. At a frequency higher than the threshold frequency,the electron is still on the metal surface.