The cut off wavelength of continuous X-ray from two Coolidge tubes operating at 30 kV but using different target materials (molybdenum Z= 42 and tungsten Z = 74) are
A
1∘A,3∘A
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B
0.3∘A,0.2∘A
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C
0.414∘A,0.8∘A
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D
0.414∘A,0.414∘A
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Solution
The correct option is D0.414∘A,0.414∘A Cut off wavelength of continuous X-rays depends solely on the voltage applied and does not depend on the material of the target. Hence the two tubes will have the same cut off wavelength. Ve=hv=hcλorλ=hcVe=6.627×10−34×3×10830×103×1.6×10−19m=0.414×10−10m=0.414∘A.