TG EAPCET 2024 (Online) 9th May Morning Shift | Atomic Structure Question 8 | Chemistry

Identify the pair of species having same energy from the following. (The number given in the bracket corresponds to principal quantum number ( $n$ ) in which the electron is present.)

$\mathrm{H}(n=1) . \mathrm{L}^{2+}(n=1)$

$\mathrm{L}^{2+}(n=3), \mathrm{Be}^{3+}(n=4)$

$\mathrm{He}^{+}(n=1), \mathrm{Li}^{2+}(n=3)$

$\mathrm{H}(n=3), \mathrm{Li}^{2+}(n=3)$

TG EAPCET 2024 (Online) 9th May Morning Shift

MCQ (Single Correct Answer)

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Which one of the following corresponds to the wavelength of line spectrum of H atom in its Balmer series ? ( $R=$ Rydberg constant)

$\frac{9}{8 R}$

$\frac{100}{21 R}$

$\frac{25}{24 R}$

$\frac{16}{15 R}$

TS EAMCET 2023 (Online) 12th May Morning Shift

MCQ (Single Correct Answer)

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The radius of third orbit of hydrogen atom is $R \mathrm{pm}$. The radius of second orbit of $\mathrm{He}^{+}$ion (in pm is)

$\frac{4}{3} R$

$\frac{3}{4} R$

$\frac{9}{2} R$

$\frac{2}{9} A$

TS EAMCET 2023 (Online) 12th May Morning Shift

MCQ (Single Correct Answer)

-0

The threshold frequency of a metal is $10^{15} \mathrm{~s}^{-1}$. The ratio of maximum kinetic energies of the photoelectrons, when the metal is made to strike with radiations of frequencies $1.5 \times 10^{15} \mathrm{~s}^{-1}$ and $2.0 \times 10^{15} \mathrm{~s}^{-1}$ respectively is

$2: 1$

$1: 2$

$4: 3$

$3: 4$

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