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General
Easy
Question
The intensity of X-rays from a Coolidge tube is plotted against wavelength as shown in the figure. The minimum wavelength found is λc and the wavelength of the Kα line is λk. As the accelerating voltage is increased
- (λk-λc) increases
- (λk-λc) decreases
- λk increases
- λk decreases
The correct answer is: (λk-λc) increases
Wavelength null is independent of the accelerating voltage (V), while the minimum wavelength null is inversely proportional to V. Therefore as V increases, null remains unchanged whereas null decreases or null will increase
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