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Physics · PYQ NEET UG 2016(1)
हिन्दीGiven the value of Rydberg constant is \( 10^7\text{ m}^{-1} \), the wave number of the last line of the Balmer series in hydrogen spectrum will be
Correct answer · Option 1
\( 0.25 \times 10^7\text{ m}^{-1} \)
Explanation
For the last line of Balmer series, \( n_1 = 2 \) and \( n_2 = \infty \). \( \bar{\nu} = R (\frac{1}{2^2} - \frac{1}{\infty^2}) = \frac{10^7}{4} = 0.25 \times 10^7\text{ m}^{-1} \).
