IAT (IISER) 2024 | Atomic Structure Question 1 | Chemistry

The minimum energy needed to remove an electron from a metal corresponds to a wavelength of 500 nm . What is the total kinetic energy of all the photoelectrons ejected per second when the entire radiation from a 100 Watt bulb with a wavelength of 300 nm falls on the surface of the metal? [Planck's constant $=6.6 \times 10^{34} \mathrm{Js}$; speed of light $=3 \times 10^8 \mathrm{~ms}^{-1}$ ]

$1.6 \times 10^{-19} \mathrm{~J}$

$2.6 \times 10^{-19} \mathrm{~J}$

40 J

80 J

IAT (IISER) 2023

MCQ (Single Correct Answer)

-1

$$ \text { How many radial nodes does } \mathrm{Ca}^{+} \text {have in its } 4 \text { s orbital? } $$

IAT (IISER) 2022

MCQ (Single Correct Answer)

-1

Which of the following expressions represents the hydrogen atom wave function $\psi(r)$ shown in the figure below? ( $r$ is the distance of the electron from the nucleus and $a_0$ is a constant)

IAT (IISER) 2022 Chemistry - Atomic Structure Question 1 English

$\cdot \frac{1}{\sqrt{\pi}}\left(\frac{1}{a_0}\right)^{3 / 2} e^{-r / 2 a_0}$

$\frac{1}{\sqrt{6 \pi}}\left(\frac{1}{a_0}\right)^{3 / 2}\left(\frac{r}{a_0}\right) e^{-r / 2 a_0}$

$\frac{1}{4 \sqrt{2 \pi}}\left(\frac{1}{a_0}\right)^{3 / 2}\left(2-\frac{r}{a_0}\right) e^{-r / 2 a_0}$

$\frac{1}{\sqrt{3 \pi}}\left(\frac{1}{a_0}\right)^{3 / 2}\left(3-\frac{2 r}{a_0}+\frac{2 r^2}{9 a_0^2}\right) e^{-r / 3 a_0}$

IAT (IISER) 2020

MCQ (Single Correct Answer)

-1

The total number of nodes for a given principal quantum number $n$, and azimuthal quantum number $\ell$, are

sum of $\ell$ angular nodes and $n+\ell-1$ radial nodes

sum of $\ell$ angular nodes and $n-\ell-1$ radial nodes

sum of $\ell+1$ angular nodes and $n-\ell-1$ radial nodes

sum of $\ell+1$ angular nodes and $n+\ell-1$ radial nodes

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