When the frequency of incident radiation is less than threshold frequency for a metal surface, what is value of stopping potential for that and why?

Explanation

To solve the question regarding the stopping potential when the frequency of incident radiation is less than the threshold frequency for a metal surface, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Threshold Frequency**:
- The threshold frequency (ν₀) is the minimum frequency of incident radiation required to eject electrons from a metal surface. If the frequency of the incident radiation (ν) is less than the threshold frequency (ν < ν₀), then photoelectric emission does not occur.

2. **Condition for Photoelectric Emission**:
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