Explain photoelectric effect Explain the effect of increase of intensity of incident radiations on photoelectrons emitted by a photo-tube.

Explanation

### Step-by-Step Solution:

**Step 1: Definition of Photoelectric Effect**
The photoelectric effect is a phenomenon where electrons are emitted from a metal surface when light of sufficient frequency (or energy) is incident on it. This effect demonstrates the particle nature of light, as it shows that light can be thought of as consisting of particles called photons.

**Step 2: Einstein's Contribution**
Albert Einstein formulated a mathematical equation to describe the photoelectric effect. He proposed that each photon has energy given by the equation:
\[ E = h \nu \]
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