X-Ray Fluorescence Analytical Techniques - CNSTN : Centre ...
X-Ray Fluorescence Analytical Techniques - CNSTN : Centre ...
X-Ray Fluorescence Analytical Techniques - CNSTN : Centre ...
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c = 3 x 10 8 m/s<br />
(i)<br />
1 2<br />
mV = eV<br />
2<br />
⇒ V = =<br />
2eV −19<br />
3<br />
2× 1.6× 10 × 18× 10<br />
m<br />
−31<br />
9× 10<br />
− 19+ 3+ 31−1 2 16 10 2<br />
⇒ V = × × ×<br />
⇒ V = 64× 10<br />
⇒ V = 8× 10 m ⋅<br />
(ii)<br />
min<br />
7<br />
14<br />
−1<br />
s<br />
hc<br />
eV =<br />
λ min<br />
hc<br />
⇒ λ min =<br />
eV<br />
−34<br />
8<br />
6.63× 10 × 3× 10<br />
⇒ λ min =<br />
−19<br />
3<br />
1.16× 10 × 18× 10<br />
⇒ λ ≈<br />
III.<br />
-11<br />
6.9 x 10 m<br />
An X-ray tube is operated with an anode potential of 10 kV and an anode current of 15 mA.<br />
Calculate<br />
i.the number of electrons hitting the anode per second,<br />
ii.the rate of production of heat at the anode stating any assumptions made,<br />
iii.the frequency of the emitted X-ray photon of maximum energy.<br />
e = 1.6 x 10 -19 C<br />
h = 6.6 x 10 -34 Js<br />
Solution<br />
I = 15 x 10 -3 A<br />
V = 10 x 10 3 V<br />
e = 1.6 x 10 -19 C<br />
h = 6.6 x 10 -34 Js<br />
(i)