A 500 W lamp radiates unpolarized power isotropically with an effi- ciency of 80%. Calculate at the distance r = 5 m: the intensity of the wave, the maximum values Ep of the electric field and Bo of the mag- netic field, the force F exerted on a disk of radius a = 5 cm, perfectly re- flecting orthogonal to the direction of propagation of the waves.

A 500 W lamp radiates unpolarized power isotropically with an effi- ciency of 80%. Calculate at the distance r = 5 m: the intensity of the wave, the maximum values Ep of the electric field and Bo of the mag- netic field, the force F exerted on a disk of radius a = 5 cm, perfectly re- flecting orthogonal to the direction of propagation of the waves.