JEE MAIN - Chemistry (2023 - 8th April Evening Shift - No. 5)
Henry Moseley studied characteristic X-ray spectra of elements. The graph which represents his observation correctly is
Given $$v=$$ frequency of $$\mathrm{X}$$-ray emitted
Z = atomic number
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_8th_April_Evening_Shift_en_5_2.png)
_8th_April_Evening_Shift_en_5_3.png)
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Explanation
Moseley's observation on characteristic X-ray spectra of elements relates frequency $(v)$ of X-rays emitted to the atomic number by the following relation:
$$ \sqrt{v}=a(Z-b) $$
The plot of $\sqrt{v}$ vs $\mathrm{Z}$ is linear with -ve intercept on Y-axis.
_8th_April_Evening_Shift_en_5_5.png)
Out of the four graphs given, graph (B) can be considered correct but it needs to be modified with respect to intercept on Y-axis.
$$ \sqrt{v}=a(Z-b) $$
The plot of $\sqrt{v}$ vs $\mathrm{Z}$ is linear with -ve intercept on Y-axis.
Out of the four graphs given, graph (B) can be considered correct but it needs to be modified with respect to intercept on Y-axis.
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