X-ray photon E?

[Xavier1234]

anyone know how to solve that? 

[curious111]

i got something like 24000eV. By finding the electron's speed, then momentum, and hence wavelength. As the wavelengths were the same, then you could solve for Photon energy

[tkjnz]

i got a really high number

[zackyjack]

I thought that if they both had the same wavelength, they should have the same energy...

[Xavier1234]

tkjinx me too. i was thinking "that cant be right!!" so i didnt go with it.   I was also dumb enough to not put an answer on the box, but i managed to sus out knowledge that may just gimme 1 consquential mark.

[rubiks]

I got 24761. All my friends said they got 12000 or something. They said the speed of the electron was the same as the previous question but when I worked it out I got a speed that was different.

[Elnino_Gerrard]

I got 24761. All my friends said they got 12000 or something. They said the speed of the electron was the same as the previous question but when I worked it out I got a speed that was different.

Yes thats what i got

[Galvanic Cell]

how did you get the speed from  the energy?

[3Xamz]

Yeah I got something like ~2*10^4

First I was like no way, then I worked out that the energy of a x-ray can range between 500ev to 1*10^5,

so then I left it as the 2.something*10^4

[curious111]

how did you get the speed from  the energy?

600 x 1.6*10^-19 is the energy in joules. Then use (1/2)m*v^2 to find speed.

[m@tty]

You get the momentum from the energy of the electrons.

Then since X-rays are electromagnetic radiation, the formula applies.

Oh and you had to convert from eV to J then back to eV at the end.


EDIT: And

[brad.j.b]

anyone know how to solve that?  

you times 600eV X 1.6 X 10^-19 to get kinetic energy
               then use 0.5mv^2 to get velocity
               then get de broglie wavelength

               which is the same as the X ray so use E=hc/wavlength
               = 24,000 ev or something like that

[coletrain]

[/quote]

you times 600eV X 1.6 X 10^-19 to get kinetic energy
               then use 0.5mv^2 to get velocity
               then get de broglie wavelength

               which is the same as the X ray so use E=hc/wavlength
               = 24,000 ev or something like that
[/quote]
i did this, got like 2.4 x 10^4

[3Xamz]

Energy of Xray = hc/lamda,

and lamda was the same as the electron? xD

[Galvanic Cell]

oh man i stuffed up.. i thought cause the info given said that it applied for 7-10, or whatever it was, that the speed would be the same :/