Two of the types of ultraviolet light, uvb and uvc, are both components of sunlight. their wavelengths range from 280 to 320 nm for uvb and from 100 to 280 nm for uvc. compare the energy of microwaves, uvb, and uvc. rank from greatest to least energy per photon. to rank items as equivalent, overlap them.

UVC > UVB > microwaves

Explanation:

Let's consider the following radiations with their ranges of wavelengths (λ).

The energy of a photon (E) can be calculated using the Planck-Einstein's equation.

E = h . c . λ⁻¹

where,

h is the Planck's constant

c is the speed of light

As we can see, the shorter the wavelength, the more energy the photon has. The rank from greatest to least energy is UVC > UVB > microwaves.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

answer seismograph;