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Q)

An X-ray tube operates on $30\: kV$. The minimum wavelength emitted is :

$\begin {array} {1 1} (a)\;6.6\: A^{\circ} & \quad (b)\;1.2\: A^{\circ} \\ (c)\;0.133\: A^{\circ} & \quad (d)\;0.4\: A^{\circ} \end {array}$

 

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A)
Ans : (d) 0.4A∘" role="presentation" style="position: relative;">0.4A0.4A∘ 0.4 \: A^{\circ}
λmin=hc/eV" role="presentation" style="position: relative;">λmin=hc/eVλmin=hc/eV \lambda_{min} = hc/eV
=6.6×10−34×3×108/(1.6×10−19×30×103)=0.4A∘" role="presentation" style="position: relative;">=6.6×1034×3×108/(1.6×1019×30×103)=0.4A=6.6×10−34×3×108/(1.6×10−19×30×103)=0.4A∘= 6.6 \times 10^{-34} \times 3 \times 10^8 / (1.6 \times 10^{-19} \times 30 \times 10^3 ) = 0.4 A^{\circ}
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