Which one of the following staements is wrong?

Frequencies of various radiations are given as

$f_V\to$ Visible light

$f_R\to$ Radio waves

$f_{UV}\to$ Ultra violet waves

Then which of following is true?

The electromagnetic wave of wavelength $1500 \mathrm{nm}$ lies in which region of the spectrum?

Match List - I with List - II:

Choose the correct answer from the options given below:

Consider the following
(i) Submarine communications
(ii) A.M. radio
(iii) Shortwave ratio
(iv) Radar

Arrange the above in increasing frequency of the waves associated with them

The wavelength of ${\mathrm{K}}_{\mathrm{\alpha }}$ spectral line is  $\lambda$  for an element of atomic number $46$ . Then the wavelength of$K_{\alpha }$ line for an element of atomic number 28 is:

Match List - I with List - II