Verified Solution • 2025–26 Session moderate

QPages 395-396: Q15: HC Verma: Concepts of Physics - Volume 2 X-Rays Pages 395-396: Q15 Solution: A certain element emits X-ray of energy 3.69 keV. Use the data…

A certain element emits KαK_\alpha X-ray of energy 3.69 keV. Use the data from the previous problem to identify the element. Use Planck constant h=6.63×10−34 Js=4.14×10−15 eVsh = 6.63 \times 10^{-34} \text{ Js} = 4.14 \times 10^{-15} \text{ eVs}, speed of light c=3×108 m/sc = 3 \times 10^8 \text{ m/s}.)

Step-by-Step Verified Solution

**Answer:** The element is Calcium (Z = 20). **Step-by-Step Explanation:** Given: E = 3.69 keV = 3690 eV. _ = 1242/3690 = 0.3366 nm. From Moseley's equation: �(c/_) = a(Z - b). �(3_10_/0.3366_10__) = 5_10_(Z - 1.39). Z = 20.17 � 20. The element is Calcium [citation:12].

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