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Hydrogen atom is bombarded with electrons accelerated through a potential difference of V, which causes excitation of hydrogen atoms. If the experiment is being performed at T=0 K, the minimum potential difference needed to observe any Balmer series lines in the emission spectra will be α/(10) V, where α= ______.

Asked in JEE Main 29th Jan 2nd Shift 2024 · Spectral series and wavelengths

Answer: 121

Step-by-step solution

A Balmer line needs the atom to reach n=3.

E₃-E₁=13.6(1-1/9)=12.1 eV

V=12.1 V=(121)/(10)

→ 121

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