Qstnid -Ii-10-the Figure Shows The Intensity-wavelength Relations Of X-rays Coming From Two Different Coolidge Tubes. The Solid Curve Represents The Relation For The Tube A In Which The Potential Difference Between The Target And The Filament Is V<sub>a</sub> And The Atomic Number Of The Target Material Is Z<sub>a</sub>. These Quantities Are V<sub>b</sub> And Z<sub>b</sub> For The Other Tube. Then, - 44: X-rays - Neet-xii-physics

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NEET-XII-Physics

44: X-rays

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#10
The figure shows the intensity-wavelength relations of X-rays coming from two different Coolidge tubes. The solid curve represents the relation for the tube A in which the potential difference between the target and the filament is V_A and the atomic number of the target material is Z_A. These quantities are V_B and Z_B for the other tube. Then,
(a) V_A > V_B, Z_A > Z_B
(b) V_A > V_B, Z_A < Z_B
(c) V_A < V_B, Z_A > Z_B
(d) V_A > V_B, Z_A < Z_B
Figure
digAnsr: b
Ans : (b) V_A > V_B, Z_A < Z_B
It is clear from the figure that the X-ray of tube A has less cutoff wavelength than the X-ray of tube B.
`` \therefore {\lambda }_{A}<{\lambda }_{B}``
Using Moseley's Law,
`` {Z}_{A}<{Z}_{B}``
`` \lambda \propto \frac{1}{V}``, where V is the voltage applied in the X-ray tube.
`` \therefore {V}_{A}>{V}_{B}``
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