The electric and magnetic fields in a charge-free region z > 0 are given by: E⃗(r⃗, t) = E0 e-αz cos(βx - ωt) ĵ B⃗(r⃗, t) = 2 E0ω e-αz [α sin(βx - ωt) î + β cos(βx - ωt) k̂] The average energy flow in the x-direction is:

Match List I (Electromagnetic wave) with List II (Production method): List I: A. Microwave B. Visible light C. Gamma rays D. Infrared rays List II: I. Electrons in atoms emit light when moving from a higher to a lower energy level II. Radioactive decay of the nucleus III. Vibration of atoms and molecules IV. Klystron valve or magnetron valve Choose the correct matching:

For a plane electromagnetic wave propagating along the +x-direction, which of the following combinations gives the correct possible directions for the electric field (E) and magnetic field (B) respectively?