In the case of electromagnetic waves,which of the following statements is incorrect?

In a plane electromagnetic wave,the maximum value of the electric field component is $4.4 \ Vm^{-1}$. The intensity of the wave is nearly (in $mW \ m^{-2}$)

Consider the following:
$I.$ Waves created on the surfaces of a water pond by a vibrating source.
$II.$ Wave created by an oscillating electric field in air.
$III.$ Sound waves travelling under water.
Which of these can be polarized?

Assertion : Radio waves can be polarised.
Reason : Sound waves in air are longitudinal in nature.

An electromagnetic wave,going through vacuum,is described by $E = E_0 \sin(kx - \omega t)$. Which of the following is independent of wavelength?

In a travelling plane electromagnetic wave,the maximum magnetic field is $1.26 \times 10^{-4} \ T$. The intensity of the wave is (Assume,$\mu_0 = 1.26 \times 10^{-6} \ H/m$)