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$X$-rays are produced in $X$-ray tube operating at a given accelerating voltage. The wavelength of the continuous $X$-rays has values from

• A
  (a) 0 to $\infty$
• ✓
  (b) $\lambda_{\min }$ to $\infty$, where $\lambda_{\min }>0$
• C
  (c) 0 to $\lambda_{\max }$ where $\lambda_{\max }<\infty$
• D
  (d) $\lambda_{\min }$ to $\lambda_{\max }$, where $0<\lambda_{\min }<\lambda_{\max }<\infty$