## 1.23 Homework

H-Atom ($E_{n}=-\frac{hR}{n^{2}}$)

vivianndo_1L
Posts: 30
Joined: Fri Apr 06, 2018 11:02 am

### 1.23 Homework

The y-ray photons emitted by the nuclear decay of a technetium-99 atom used in pharmaceuticals have an energy of 140.511 keV. Calculate the wavelength of these y-rays.

I managed to convert the keV to Joules but now I don't know what to do. Can someone please help?

jessicasam
Posts: 36
Joined: Wed Nov 15, 2017 3:02 am
Been upvoted: 1 time

### Re: 1.23 Homework

So now that you have E= 2.2513 x 10^-14 J you can use the equations E=hv and c=vλ

You combine the equations to:

λ= hc/ E

λ= (6.626x10^-34 Js) (2.997x10^8m s-1)/ (2.2513x10^-14J)

λ=8.8237x10^-12 m

vivianndo_1L
Posts: 30
Joined: Fri Apr 06, 2018 11:02 am

### Re: 1.23 Homework

Oh okay I see, thanks!

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