Find the maximum kinetic energy of the photoelectrons ejected when light of wavelength 350nm is incident on a cesium surface. Work function of cesium = ` 1.9 e V. `

Explanation

To find the maximum kinetic energy of the photoelectrons ejected when light of wavelength 350 nm is incident on a cesium surface with a work function of 1.9 eV, we can follow these steps:

### Step 1: Understand the Photoelectric Effect
The photoelectric effect describes how electrons are emitted from a material (like cesium) when it absorbs light (photons). The energy of the incoming photons must be greater than the work function of the material to eject electrons.

### Step 2: Use the Einstein Photoelectric Equation
The maximum kinetic energy (K.E.) of the ejected photoelectrons can be calculated using the Einstein photoelectric equation:
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