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Bihar Board Class 12 · Physics · 13 past questions

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1. Q1 2026 Set A

   The solar spectrum is

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2. Q2 2026 Set A

   The radius of the lowest Bohr's orbit in hydrogen atom is $r_0$. The radius of Bohr's second orbit is

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3. Q3 2026 Set A

   The kinetic energy ($K$) of an electron in a Bohr orbit is related to its potential energy ($U$) by

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