What is the frequency of an electromagnetic wave with energy of 5.0 x 10-20
j?

7.546 × 10^13 Hz

In this case;

Energy, E = 5.0 × 10^-20 Joules

We are required to find the frequency, f

Using the equation;

E = hf

f = E ÷ h

 = 5.0 × 10^-20 J ÷ 6.626 × 10^-34 J-s

= 7.546 × 10^13 Hz

= 7.55 × 10^13 Hz

Thus, the frequency of the electromagnetic wave is 7.55 × 10^13 Hz

hi,

the capital city of australia is canberra.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72