EASY
12th Maharashtra Board
IMPORTANT
Earn 100

State the name of the visible series in hydrogen spectrum.

Important Questions on Atoms, Molecules and Nuclei

HARD
12th Maharashtra Board
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Atoms, Molecules and Nuclei>Maharashtra Board-2018>Q 1
The momentum associated with photon is given by ____.
MEDIUM
12th Maharashtra Board
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Atoms, Molecules and Nuclei>Maharashtra Board-2018>Q 3

Draw a neat and labelled energy level diagram and explain Balmer series and Brackett series of spectral lines for hydrogen atom.

EASY
12th Maharashtra Board
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Atoms, Molecules and Nuclei>Maharashtra Board-2019>Q 4
An electron of energy 150 eV has wavelength of 10-10 m. The wavelength of a 0.60 keV electron is
HARD
12th Maharashtra Board
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Atoms, Molecules and Nuclei>Maharashtra Board-2019>Q 5
Using an expression for energy of electron, obtain the Bohr’s formula for hydrogen spectral lines.
HARD
12th Maharashtra Board
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Atoms, Molecules and Nuclei>Maharashtra Board-2019>Q 6
State the law of radioactive decay. Hence derive the relationN = N0e-λt.  Represent it graphically.
MEDIUM
12th Maharashtra Board
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Atoms, Molecules and Nuclei>Maharashtra Board-2020>Q 7
In hydrogen atom, electron jumps from the 3rd orbit to the 1st orbit. The change in angular momentum is _____.
MEDIUM
12th Maharashtra Board
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Atoms, Molecules and Nuclei>Maharashtra Board-2020>Q 9
State any two postulates of Bohr’s theory of hydrogen atom.
EASY
12th Maharashtra Board
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 18 - Atoms, Molecules and Nuclei>Maharashtra Board-2020>Q 10
Energy of an electron in the second Bohr orbit is –3.4 eV. Calculate the energy of an electron in the third Bohr orbit.