Write Einstein's photoelectric equation. State clearly any two salient features observe in photoelctric effect, which can be explained on the basis of the above equation.

Explanation

**Step-by-Step Solution:**

1. **Write Einstein's Photoelectric Equation:**
Einstein's photoelectric equation can be expressed as:
\[ E = h\nu = \phi_0 + K_{\text{max}} \]
where:
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