Find the frequency if given energy 6.3x10^-19

Do I use the formula E=hf?
6.3x10^-19=6.626x10^-34(f)

Then do I divide E and H?

yes, E divided by h.

f = E/h

Yes, you are on the right track. To find the frequency, you can use the formula E = hf, where E is the energy and h is Planck's constant (approximately 6.626 x 10^(-34) J·s).

To find the frequency, you need to rearrange the formula to solve for f:

E = hf
f = E / h

Now you can substitute the given values into the formula:
f = (6.3 x 10^(-19) J) / (6.626 x 10^(-34) J·s)

To divide these values, you need to divide the numerator by the denominator:

f ≈ 9.51 x 10^14 Hz

So, the frequency is approximately 9.51 x 10^14 Hz.