Hard X-rays for the study of fractures in bones should have a minimum wavelength of 10^ -11 ~m . The accelerating voltage for electrons in X-ray machine should be

Correct answer: B. >124.2 kV aligned & : λ_ =(h c)/(e V)= 1.242 × 10^ -6 V & V= 1.242 × 10^ -6 10^ -11 =124.2 kV aligned The accelerating voltage for electrons in X-ray machine should be greater than 124.2 kV .

AIIMS 2006

Exam: AIIMS
Year: 2006
Subject: Physics
Chapter: Electromagnetic Waves

AIIMS 2006 · Physics · Electromagnetic Waves

Hard X-rays for the study of fractures in bones should have a...

Hard X-rays for the study of fractures in bones should have a minimum wavelength of

10^{-11} \mathrm{~m}

. The accelerating voltage for electrons in X-ray machine should be

Options

A $< 124.2 \mathrm{kV}$
B $>124.2 \mathrm{kV}$
Cbetween $60 \mathrm{kV}$ and $70 \mathrm{kV}$
D $=100 \mathrm{kV}$ .

Correct answer

B. $>124.2 \mathrm{kV}$

Step-by-step solution

\begin{aligned}& : \lambda_{\min }=\frac{h c}{e V}=\frac{1.242 \times 10^{-6}}{V}\\ & V=\frac{1.242 \times 10^{-6}}{10^{-11}}=124.2 \mathrm{kV} \end{aligned}

The accelerating voltage for electrons in X-ray machine should be greater than

124.2 \mathrm{kV}

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