Physics · 2023
JEE Main · 15 April 2023, Shift 1 · Q44
The half-life of a radioactive nucleus is 5 years. The fraction of the original sample that would decay in 15 years is:
The half-life of a radioactive nucleus is $\displaystyle 5$ years. The fraction of the original sample that would decay in $\displaystyle 15$ years is:
Official answer
From NTA’s final answer key for this paper.
(4)
$\displaystyle \frac{7}{8}$
More from Atoms and Nuclei
- Energy released when two deuterons (_1 H^2) fuse to form a helium nucleus (_2 He^4) is: (Given: Binding energy per nucleon of _1 H^2=1.1 MeV and…2025
- Assuming the validity of Bohr's atomic model for hydrogen like ions the radius of Li^++ ion in its ground state is given by 1/X a_0, where X= ____.…2025
- In the hydrogen atom, the electron makes a transition from the higher orbit (i) to a lower orbit (f). The ratio of the radius of the orbits in given…2026
- In a nuclear fission reaction of an isotope of mass M, three similar daughter nuclei of same mass are formed. The speed of a daughter nuclei in terms…2024
- Experimentally it is found that 12.8 eV energy is required to separate a hydrogen atom into a proton and an electron. So the orbital radius of the…2023
- The radius of 2^nd orbit of He^+ of Bohr's model is r_1 and that of fourth orbit of Be^3+ is represented as r_2. Now the ratio r_2/r_1 is x: 1. The…2023
- Hydrogen atom is bombarded with electrons accelerated through a potential difference of V, which causes excitation of hydrogen atoms. If the…2024
- An atom _3^8 X is bombarded by shower of fundamental particles and in 10 s this atom absorbed 10 electrons, 10 protons and 9 neutrons. The percentage…2026
JEE Main 2023 Physics question, with the answer from NTA’s final answer key. Where our answers come from.