The phenomenon of photoelectric effect was first explained by

Photoelectric effect can be explained by

Photoelectric effect is explained by

Photoelectric effect as explained by

The phenomena of photoelectric effect was successfully explained by:

Explain the phenomenon photoelectric effect.

Photoelectric effect was successfully explained first by

Explain photoelectric effect.

Assertion : X-rays show the phenomenon of photoelectric effect. Reason : The energy of X-ray photon is quite large.