We can reasonably model a 75 W incandescent light bulb as a sphere 6.0 cm in diameter. Typically, only about 5 % of the energy goes to visible light: the rest foes largely to nonvisible infrared radiation.(a) What is the visible light intensity (in W/m^2) at the surface of the bulb?(b) What are the amplitudes of the electric and magnetic fields at this surface, for a sinusoidal wave with this intensity?

a

b

And

Explanation:

From the question we are told that  

   The  power is  

   The  diameter is  

Generally the radius is mathematically represented as

=>  

=>  

Generally the area of the sphere is mathematically evaluated as

=>      

=>      

Generally the total  Intensity of the  incandescent light bulb is mathematically represented as

=>    

=>  

Given that 5%  of the energy goes to visible  light

Then the intensity that goes visible light is  

The amplitude of the electric field at the surface is mathematically represented as

=>  

=>    

The amplitude of the magnetic  field at the surface is mathematically represented as

=>    

=>