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Question

Given curve shows the intensity wavelength relation of Xrays coming from two different Coolidge tubes A and B. The dark curve represents the relation for the tube A in which potential difference between the target and the filament is VA and the atomic number of the target material is ZA. Similarly dotted curve is for tube B. Respective quantities are VB and ZB foe the tube B. The,

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A
VA>VB,ZA>ZB
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B
VA>VB,ZA<ZB
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C
VA<VB,ZA>ZB
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D
VA<VB,ZA<ZB
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Solution

The correct option is B VA>VB,ZA<ZB
λmin=hceV
λ1V
λ2>λ1(refer to graph)
V1>V2
ν=a(Zb)(Mosley's Law)
ν(Z1)2λ1(Z1)2(ν1λ)
λ1>λ2(refer to graph for characteristic line).
ZA<ZB
VA>VB
Hence, B is correct

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