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Q.

If a voltage applied to an X-ray tube is increased to 1.5 times the minimum wavelength (λmin) of at X-ray continuous spectrum shifts by Δλ = 26 pm. The initial voltage applied to the tube is

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a

≈ 10 kV

b

≈ 16 kV

c

≈ 50 kV

d

≈ 75 kV

answer is B.

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Detailed Solution

λmin=hceV⇒λ1hceV1 and  λ2=hceV2∴Δλ=λ2−λ1=hce1V2−1V1.Given  V2=1.5V1on  solving  we  get  V1=16000  volt  =16kV.
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If a voltage applied to an X-ray tube is increased to 1.5 times the minimum wavelength (λmin) of at X-ray continuous spectrum shifts by Δλ = 26 pm. The initial voltage applied to the tube is