What is the maximum power that can be delivered by a 1.4-cm-diameter laser beam propagating through air

Complete Question

The maximum electric field strength in air is 4.0 MV/m. Stronger electric fields ionize the air and create a spark. What is the maximum power that can be delivered by a 1.4-cm-diameter laser beam propagating through air

The  value  is  

Explanation:

From the question we are told that

   The  electric field strength is  

    The  diameter is  

Generally the radius is mathematically represented as

=>    

=>    

Generally the cross-sectional area is mathematically represented as

Generally the maximum power that can be delivered is mathematically represented as

Here c is the speed of light with value  

        is the permittivity of free space with value  

you get 2.3=1.21*\frac{a}2 or 4.6=1.21a or a=3.802 (b)

explanation: