Sources of Electromagnetic Waves

Which one of them is used to produce a propagating electromagnetic wave?

Electromagnetic waves can be produced by

Electromagnetic waves can be produced by

Microwave oven acts on the principle of:

Consider an $EM$ wave with magnetic field $B={10}^{-4}\mathrm{s}\mathrm{i}\mathrm{n}\left(\omega t-kx\right).$ The maximum value of its electric field in SI units is

Suppose that the electric field part of an electro-magnetic wave in vacuum is $\overrightarrow{E}=3.1 \cos \left[\right(1.8 y) +\hspace{0.17em}(5.4 \times {10}^8 t\left)\right] \hat{i}$. What is the direction of propagation?

Which of the following rays is emitted by a human body?