Modern Physics 4 Question 16

16. The intensity of X-rays from a coolidge tube is plotted against wavelength λ 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

(2001,2M)

(a) λkλc increases

(b) λkλc decreases

(c) λk increases

(d) λk decreases

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Solution:

  1. Wavelength λk is independent of the accelerating voltage (V), while the minimum wavelength λc is inversely proportional to V. Therefore, as V is increased, λk remains unchanged whereas λc decreases or λkλc will increase.


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