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What is the minimum voltage to be applied toan X ray bulb to obtain all the lines of K series with anticathode made of copper? 1) 5,700V 2) 10,700V 3)15,700V 4)20,700V

What is the minimum voltage to be applied toan X ray bulb to obtain all the lines of K series with anticathode made of copper?
1) 5,700V 2) 10,700V 3)15,700V 4)20,700V

Grade:9

1 Answers

Aziz Alam IIT Roorkee
askIITians Faculty 233 Points
7 years ago
Voltage supply gives the energy to electron=
E= eV
Energy required to knock out the K shell electron form Copper atom is equal to the minimum voltage required to get all the charesteristic peaks of Copper
E_ k_n_o_c_k_o_u_t=\frac{hc}{\lambda }={hcR(Z-1)^2}
Now for the necessary event to take place,
E_ k_n_o_c_k_o_u_t=E

From quating the two equations:
V=\frac{hcR(Z-1)^2}{e}
Substituting the values of constants,
we get ,
V=10685.02134 V
almost equal to 10,700 V

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