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At one instant, the electric and magnetic fields at one point of an electromagnetic wave are...

At one instant, the electric and magnetic fields at one point of an electromagnetic wave are E? =(220i^+300j^?60k^)V/m and B? =(7.8i^?7.3j^+ak^)B0.

1) What is the value of a?

2) What is the value of B0?

3) What is the Poynting vector at this time and position? Find the x-component.

4)Find the y-component.

5) Find the z-component.

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