32. Electromagnetic Waves

Electromagnetic waves produced byX-raymachines typically haveafrequencyof approximately$3.5\(\times\)10^{16}Hz$ .What is the wave numberof thesewaves?

The magnetic field of a travelling electromagnetic wave is described by the wave function $B\(\left\)(z,t\(\right\))=1.0\(\times\)10^{-3}\(\sin\]\left\)(kz-1.27\(\times\)10^{12}t\(\right\))$, where k is the wave number. Write the complete wave function for the electric field of this wave.