It is determined that a certain wave of infrared light has a wavelength of 8.45 mm
c=2.99 x 108 m/s, what is the frequency of this infrared wave? (Round your an
figures.)

3.54 x 10^10Hz

Explanation:

Given that:

wavelength = 8.45 mm

Since unit of wavelength is metres, convert 8.45 millimeters to metres

(If 1000mm = 1m

8.45mm = 8.45/1000 = 8.45 x 10^-3m)

Wave speed (c) = 2.99 x 10^8 m/s

Frequency of the infrared wave = ?

Now apply the formula

wavespeed = frequency x wavelength

i.e C = F λ

Where F = C / λ

F = 2.99 x 10^8 m/s / 8.45 x 10^-3m

F = 3.54 x 10^10Hz

Thus, the frequency of this infrared wave is

3.54 x 10^10 Hertz

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.

narendra modi is currently the pm of india

explanation: