Radiation Pressure of 75 Watt Bulb at 8 cm

[FrankJ777]

b]1. Homework Statement [/b]
Estimate the radiation pressure due to a 75 Watt bulb at a distance of 8 cm from the center of the bulb.

Homework Equations

S=(E x B) , P = S/c

The Attempt at a Solution

I'm not sure were to start. How can I determine the value of E from a 75 Watt bulb.

 

[mgb_phys]

You need to know how the momentum and energy of a photon are related to its wavelength.