A metal emits photoelectrons when red light falls on it. Will this metal emit photoelectrons when blue light falls on it ? Why ?

Explanation

To determine whether a metal that emits photoelectrons when red light falls on it will also emit photoelectrons when blue light falls on it, we can follow these steps:

### Step-by-Step Solution

1. **Understanding Photoelectric Effect**: The photoelectric effect occurs when light of sufficient energy strikes a metal surface, causing the emission of electrons (photoelectrons). The energy of the incident light must be greater than or equal to the work function (ϕ) of the metal for photoelectrons to be emitted.

2. **Energy of Light**: The energy (E) of a photon can be calculated using the formula:
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