Which of the following waves has the maximum wavelength?

Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs.
$(a)$ $21 \; cm$ (wavelength emitted by atomic hydrogen in interstellar space).
$(b)$ $1057 \; MHz$ (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift).
$(c)$ $2.7 \; K$ (temperature associated with the isotropic radiation filling all space; thought to be a relic of the 'big-bang' origin of the universe).
$(d)$ $5890 \; \mathring{A} - 5896 \; \mathring{A}$ (double lines of sodium).
$(e)$ $14.4 \; keV$ (energy of a particular transition in $^{57}Fe$ nucleus associated with a famous high-resolution spectroscopic method, Mossbauer spectroscopy).

The energy of a gamma $(\gamma)$ ray photon is $E_{\gamma}$,and that of an $X$-ray photon is $E_{X}$. If the visible light photon has an energy of $E_{v}$,then we can say that:

Write the range of frequencies for radio waves and $FM$ band radio.

What is called as the electromagnetic spectrum?

Which waves are used for $LASIK$ surgery?