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Q.

An x-ray tube has three main controls. (i) the target material (its atomic number z (ii) the filament current $(I_{f})$ and (iii) the acceleration voltage (V) .Figure shows a typical intensity distribution against wavelength. Which of the following is incorrect?

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a

The limit $λ_{m i n}$ is proportional to $V^{- 1}$

b

The sharp peak shifts to the right as Z in increased

c

The penetrating power of X ray increases if V increased

d

The intensity everywhere increases if filament current $I_{f}$ is increased

answer is B.

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Detailed Solution

for continuous X ray cutoff wavelength $\frac{h c}{λ} = e V$ and intensity of the continuous X ray increases if filament current increases but frequency of the characteristic X ray $\sqrt{ν}$ is proportional to Z so as z increases $λ$ decreases so it shifts towards left.

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An x-ray tube has three main controls. (i) the target material (its atomic number z (ii) the filament current If and (iii) the acceleration voltage (V) .Figure shows a typical intensity distribution against wavelength. Which of the following is incorrect?