The maximum kinetic energy of electrons emitted by a photocell is 2-8 V. What is the stopping potential ?

Explanation

To solve the problem, we need to determine the stopping potential (V_sp) given the maximum kinetic energy (KE_max) of the emitted electrons from a photocell.

### Step-by-Step Solution:

1. **Understanding the relationship between kinetic energy and stopping potential**:
The maximum kinetic energy (KE_max) of the emitted electrons can be expressed in terms of the stopping potential (V_sp) using the formula:
\[
KE_{max} = -e \cdot V_{sp}
...