State how in a photo-cell, the work function of the metal influence the kinetic energy of the emitted electrons.
(a) If the intensity of the incident radiation is doubled, what change occur in (i) the stopping potential and (ii) in photoelectric current?
(b) If the frequency of the incident radiation is doubled, what changes occur in the (i) stopping potential and (ii) photoelectric current.

Explanation

### Step-by-Step Solution

**1. Influence of Work Function on Kinetic Energy of Emitted Electrons:**
- The work function (φ₀) of a metal is the minimum energy required to remove an electron from the surface of the metal.
- The kinetic energy (K.E.) of the emitted electrons can be expressed using the photoelectric equation:
\[ K.E. = h\nu - φ₀ \]
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