IAT (IISER) 2025 | 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 2 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) Subjects

Browse all chapters by subject

Biology

Botany

Cell - The Unit of Life Biomolecules Cell Cycle and Cell Division Sexual Reproduction in Flowering Plants Microbes in Human Welfare Anatomy of Flowering Plants Mineral Nutrition Respiration in Plants Biotechnology: Principles and Processes Biodiversity and Conservation Morphology of Flowering Plants Photosynthesis in Higher Plants Principles of Inheritance and Variation Molecular Basis of Inheritance Organisms and Populations Ecosystem

Zoology

Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Neural Control and Coordination Reproduction in Organisms Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Breathing and Exchange of Gases