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JIPMER 2004
Exam
JIPMER
Year
2004
Subject
Physics
Chapter
Electromagnetic Waves

JIPMER 2004 · Physics · Electromagnetic Waves

20 kV potential is applied across X-ray tube, the minimum...

20 kV potential is applied across X-ray tube, the minimum wavelength of X-ray emitted will be

Options

  1. A0.62A˚0.62 Å
  2. B0.37A˚0.37 Å
  3. C1.62A˚1.62 Å
  4. D1.31A˚1.31 Å

Correct answer

A. 0.62A˚0.62 Å

Step-by-step solution

From relation, hcλmin⁡=eV\frac{h c}{\lambda_{\min }}=e V or λmin⁡=hceVor\quad \lambda_{\min }=\frac{h c}{e V} orλmin⁡=6.6×10−34×3×1081.6×10−19×20×103=0.62×10−10 m=0.62A˚\begin{aligned} \lambda_{\min } & =\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{1.6 \times 10^{-19} \times 20 \times 10^3} \\ & =0.62 \times 10^{-10} \mathrm{~m}=0.62 Å\end{aligned}$$
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