Atoms & Nuclei
Bohr model, hydrogen spectrum, nuclear structure, mass-energy, radioactivity, fission and fusion.
Test yourself on Atoms & Nuclei
5 real CUET UG questions with instant answers — no signup, ~3 minutes.
Study notes are still being prepared.
Don't wait — Shishya can teach you this topic right now, on demand.
Ask Shishya to teach this →Need more? Ask Shishya
Shishya is your personal tutor for this topic. Pick a starter or open a free chat.
- Go deeper on this topicGo deeper on Atoms & Nuclei for CUET UG — examples and edge cases I should know.
- Show me exam shortcutsGive me 3 fastest shortcuts to solve Atoms & Nuclei questions in the exam.
- What mistakes should I avoid?What are the most common mistakes students make on Atoms & Nuclei? How do I avoid them?
- Quiz me adaptivelyQuiz me on Atoms & Nuclei — start with one easy question, then go harder based on how I answer.
Practice this topic
Take a full mock →Q1 · Atoms & Nuclei · EASY
In Bohr's model of the hydrogen atom, an electron in the ground state (n = 1) has a certain angular momentum. What is the angular momentum of an electron in the third orbit (n = 3)?
Q2 · Atoms & Nuclei · MEDIUM
The first line of the Balmer series in the hydrogen spectrum corresponds to a transition from n = 3 to n = 2. The wavelength of this line is approximately 656 nm. In which region of the electromagnetic spectrum does this line appear?
Q3 · Atoms & Nuclei · MEDIUM
A radioactive element has a half-life of 20 days. If initially there are 16 grams of this element, how much of it will remain after 60 days?
Q4 · Atoms & Nuclei · HARD
In a nuclear fission reaction, a uranium-235 nucleus absorbs a neutron and splits into two lighter nuclei along with 3 neutrons. If the mass of U-235 is 235.044 u, the mass of the neutron is 1.009 u, and the combined mass of the products (including the 3 neutrons) is 236.053 u, what is the energy released in this fission? (Given: 1 u = 931.5 MeV/c²)
Q5 · Atoms & Nuclei · EASY
In a hydrogen atom, an electron transitions from the n = 3 state to the n = 1 state. If the energy of the photon emitted is E₁, and another electron transitions from n = 4 to n = 2 emitting energy E₂, what is the ratio E₁/E₂?