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Hrishant Goswami Grade: 10
        Use Moseley’s law with b = 1 to find the frequency of the K base α x-ray of La(Z = 57) if the frequency of the K base α X-ray of Cu(Z = 29) is known to be 1.88 × 10^18 Hz. 
3 years ago

Answers : (1)

Jitender Pal
askIITians Faculty
365 Points
										b = 1

For ∝ a (57)
√v = a (Z - b)
⇒ √v = a (57 – 10 = a * 56 … (1)
For Cu(29)
√1.88 * 10^78 = a(29 - 1) = 28 a … (2)
Dividing (1) and (2)
√v/1.88 * 10^18 = a*56/a*28 = 2.
⇒ v = 1.88 * 10^18(2)^2 4 * 1.88 * 10^18 = 7.52 * 10^8 Hz.
3 years ago
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