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Question

The intensity of X-rays from a Coolidge tube is plotted against wavelength as shown in the figure. The minimum wavelength found is lambda subscript c end subscript and the wavelength of the K subscript alpha end subscriptline is lambda subscript k end subscript. As the accelerating voltage is increased

  1. left parenthesis lambda subscript K end subscript minus lambda subscript C end subscript right parenthesis rightwards arrow over short leftwards arrow increases    
  2. left parenthesis lambda subscript K end subscript minus lambda subscript C end subscript right parenthesis rightwards arrow over short leftwards arrow decreases    
  3. lambda subscript K end subscript increases    
  4. lambda subscript K end subscript decreases    

The correct answer is: left parenthesis lambda subscript K end subscript minus lambda subscript C end subscript right parenthesis rightwards arrow over short leftwards arrow increases


    Wavelength lambda subscript k end subscript is independent of the accelerating voltage (V), while the minimum wavelength lambda subscript c end subscript is inversely proportional to V. Therefore as V increases, lambda subscript k end subscript remains unchanged whereas lambda subscript c end subscript decreases or lambda subscript k end subscript minus lambda subscript c end subscript will increase

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