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Q.

The intensity distribution of X-rays from two Coolidge tubes operated on different voltages V1  and  V2 and usingdifferent target materials of atomic numbers Z1  and  Z2 is shown in the figure. Which one of the following inequalities is true?

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a

V1>V2;Z1

b

V1>V2;Z1>Z2

c

V1Z2

d

V1=V2;Z1

answer is A.

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Detailed Solution

By Moseley'slaw,lmin=hceV⇒λ∝1V∴λ2>λ1see   graph⇒V1>V2v=aZ−b         .         .          .       Moseley's  lawv∝Z−12⇒λ∝1Z−12      .   ∴v∝1λλ1>λ2see  graph  for  characteristic  lines⇒Z2>Z1.
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