Atomic Structure · JEE Advanced previous year questions

2023 2 questions

1. Q352023 · 4 Jun 2023 · Paper 2
   
   1. A.$1\sigma <1{\sigma }^{\ast }<1\pi <2\sigma <1{\pi }^{\ast }<2{\sigma }^{\ast }$
   2. B.$1\sigma <1{\sigma }^{\ast }<1\pi <2\sigma <2{\sigma }^{\ast }<1{\pi }^{\ast }$
   3. C.$1\sigma <1{\sigma }^{\ast }<2\sigma <1\pi <1{\pi }^{\ast }<2{\sigma }^{\ast }$
   4. D.$1\sigma <1{\sigma }^{\ast }<2\sigma <1\pi <2{\sigma }^{\ast }<1{\pi }^{\ast }$
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   Answer: C

2. Q452023 · 4 Jun 2023 · Paper 2· Numerical answer

   For ${\mathrm{He}}^{+}$, a transition takes place from the orbit of radius $105.8\text{ pm}$ to the orbit of radius $26.45\text{ pm}$. The wavelength (in $\text{nm}$) of the emitted photon during the transition is _____. [Use: Bohr radius, $a=52.9\text{ pm}$ Rydberg constant, $R_{\mathrm{H}}=2.2\times 10^{-18}\text{ J}$ Planck's constant, $h=6.6\times 10^{-34}\text{ J s}$ Speed of light, $c=3\times 10^8{\text{ m s}}^{-1}$]

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   Answer: 30