Question

The tube in a medical research X-ray unit uses lead (Z=82) as it's target.

1)

Use the Bohr model to estimate the minimum kinetic energy electrons must have to in order for K_α X-rays to just appear in the X-ray spectrum of the tube.

E_e =

2)

Assuming the electrons are accelerated from rest through a voltage, V, what is the minimum voltage necessary to produce the K_α X-rays?

Answer 1

1) 89229.6 eV

2) 89229.6 Volts

En= -13.6 (2+)2 SE= 13.6 (2-122 cl n2 Kemin = 13.6 (82-1)2 Vol 89229.6 ev = 189.23 ker 189 229.6ev) se = 89.23 x 103 ev 1,6x1019 8c - 89.23 x 103 x 1,6810193ler 1.6x10-19 C 189.23 kV or 89230 V