The wave theory of light does not explain

In case of photoelectric effect experiment explain the following facts giving reasons: The wave theory of light could not explain the existence of the threshold frequency.

What was the difficulty in established the wave theory of light and who explained it ?

By Huygens's wave theory of light we cannot explain the phenomenon of

Huygen's wave theory of light could not explain

Wave theory of light only can explain

Huygen's wave theory of light could not explain

Huygen's wave theory of light could not explain

Why does the wave theory of light fail to explain the photoelectric effect.