Which of the following is not transported by electromagnetic waves?

What is the range of frequency of $EM$ waves that are reflected back by the ionosphere?

An electromagnetic wave travels along the $z$-axis. Which of the following pairs of space and time-varying fields would generate such a wave?

The electric field of an electromagnetic wave in free space is represented as $\vec{E} = E_0 \cos(\omega t - kz) \hat{i}$. The corresponding magnetic induction vector will be:

In a two-wire transmission line,the power flows .......

Why is the orientation of the portable radio with respect to the broadcasting station important?