Working out the frequency/wavelength of a photon.

[physics369]

Homework Statement

In an atom, an electron goes from the 4th energy level (at -0.26J x 10^-18) to the 3rd energy level (at -0.59J x 10^-18) and a photon is subsequently released.

How do you work out the frequency of the photo and its wavelength.

Homework Equations

E=hf
wavelength = c/f

The Attempt at a Solution

E=hf

Therefore, f=E/h so...

-0.59 - -0.26 = -0.33

so...

f = 0.33 x 10^-18 / 6.63 x 10 ^-34

= 4.977 x10^-14 Hz

And as wavelength = c/f...

wavelength = 3x10⁸ (Speed of light) / 4.997 x10^-14 = 6.0277 x10²¹

However, the wavelength surely can't be that large?! Where did I make a mistake?

 

[rock.freak667]

f = 0.33 x 10^-18 / 6.63 x 10 ^-34

= 4.977 x10^-14 Hz

And as wavelength = c/f...

wavelength = 3x10⁸ (Speed of light) / 4.997 x10^-14 = 6.0277 x10²¹

this f should f = 4.977(10⁺¹⁴) Hz.