TG EAPCET 2024 (Online) 9th May Evening Shift | Atomic Structure Question 7 | Chemistry

The kinetic energy of electrons emitted, when radiation of frequency $1.0 \times 10^{15} \mathrm{~Hz}$ hits a metal, is $2 \times 10^{-19} \mathrm{~J}$. What is the threshold frequency of the metal (in Hz )? $\left(h=6.6 \times 10^{-34} \mathrm{Js}\right)$

$35 \times 10^{15}$

$3.3 \times 10^{14}$

$6.97 \times 10^{15}$

$6.97 \times 10^{14}$

TG EAPCET 2024 (Online) 9th May Morning Shift

MCQ (Single Correct Answer)

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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 Evening Shift

MCQ (Single Correct Answer)

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The wavelength of second line of Balmer series of hydrogen atom is $\lambda \mathrm{nm}$. What is the wavelength of first line of Lyman series of $\mathrm{He}^{+}$ion (in nm )?

$\lambda / 16$

$16 / \lambda$

$16 / 3 \lambda$

$3 \lambda / 16$

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