JEE Physics
Radioactive Decay & Half-Life: JEE Questions & Solutions
14 previous-year JEE Physics questions on Radioactive Decay & Half-Life, each with a worked step-by-step solution.
Previous-year questions
- 01A radioactive nucleus n₂ has 3 times the decay constant as compared to the decay constant of another radioactive nucleus n₁. If the initial…MCQEasyJEE 2025
- 02Choose the correct nuclear process from the below options [p: proton, n: neutron, e⁻: electron, e⁺: positron, ν: neutrino, ν: antineutrino]:MCQEasyJEE 2025
- 03A radioactive material P first decays into Q and then Q decays to non-radioactive material R. Which of the following figure represents time…MCQEasyJEE 2025
- 04Consider the following radioactive decay process: ²¹⁸₈₄A → α A₁ → β⁻ A₂ → γ A₃ → α A₄ → β⁺ A₅ → γ A₆ The mass number and the atomic number…MCQEasyJEE 2023
- 05If a radioactive element with a half-life of 30 min undergoes beta decay, the fraction of the radioactive element that remains undecayed…MCQEasyJEE 2023
- 06A radioactive element ²⁴²₉₂X emits two α-particles, one electron, and two positrons. The product nucleus is represented by ²³⁴_PY. The…NVAEasyJEE 2023
- 07Substance A has atomic mass number 16 and half-life of 1 day. Another substance B has atomic mass number 32 and half-life of 1/2 day. If…MCQEasyJEE 2023
- 08A radioactive nucleus decays by two different processes. The half-life of the first process is 5 minutes and that of the second process is…NVAEasyJEE 2023
- 09A free neutron decays into a proton but a free proton does not decay into neutron. This is because:MCQEasyJEE 2023
- 10The decay constant for a radioactive nuclide is 1.5 × 10⁻⁵ s⁻¹. Atomic weight of the substance is 60 g mole⁻¹ (N_A = 6 × 10²³). The…NVAEasyJEE 2023
- 11The half-life of a radioactive substance is T. The time taken for disintegrating 7/8 part of its original mass will be:MCQEasyJEE 2023
- 12Two radioactive elements A and B initially have the same number of atoms. The half-life of A is the same as the average life of B. If λ_A…MCQEasyJEE 2023
- 13A common example of alpha decay is ²³⁸₉₂ U → ²³⁴₉₀ Th + ⁴₂ He + Q. Given: ²³⁸₉₂ U = 238.05060 u, ²³⁴₉₀ Th = 234.04360 u, ⁴₂ He = 4.00260 u,…NVAEasyJEE 2023
- 14The half-life of a radioactive nucleus is 5 years. The fraction of the original sample that would decay in 15 years isMCQEasyJEE 2023
Frequently asked questions
Our bank has 14 previous-year JEE Physics questions tagged to Radioactive Decay & Half-Life, drawn from JEE papers between 2023 and 2025, including 3 from 2025 alone. Each comes with a full step-by-step solution.
Radioactive Decay & Half-Life is rated Intermediate overall for JEE Physics. The PYQs on this page break down as 14 easy.
Of the 14 previous-year questions on Radioactive Decay & Half-Life, 10 are multiple-choice (MCQ) and 4 are numerical-value (NVA) questions.
Based on recent paper analysis, Radioactive Decay & Half-Life is worth about 1 mark in JEE Main. It sits in Atoms & Nuclei, a Class 12 Physics chapter.
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