MCQ
The lines in Balmer series have their wavelengths lying between
- A$1266 \,\mathring A$ to $3647 \,\mathring A$
- B$642 \,\mathring A$ to $3000 \,\mathring A$
- ✓$3647 \,\mathring A$ to $6563 \,\mathring A$
- DZero to infinity
$\frac{1}{\lambda_{\max }}=R\left(\frac{1}{2^2}-\frac{1}{\infty}\right)$
$\frac{1}{\lambda_{\max }}=R\left(\frac{1}{2^2}-\frac{1}{3^2}\right)$ solve for the range
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Reason : The grating spacing is not of the order of $X-$ ray wavelengths.