\({}^{290}_{82}X \xrightarrow{\alpha} Y \xrightarrow{e^+} Z \xrightarrow{\beta^-} P \xrightarrow{e^-} Q\)
In the nuclear emission stated above, the mass number and atomic number of the product \(Q\) respectively, are :
Composition and size of nucleus, atomic masses
Every question from past board papers on Composition and size of nucleus, atomic masses, newest paper first. Open any question for its full worked answer.
NEET UG 2024 question paper (official, booklet S6)
Full paper →NEET UG 2023 question paper (official, booklet G6)
Full paper →-
The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to \(\left(\frac{1}{16}\right)^{th}\) of its initial value?
NEET UG 2022 question paper (official, booklet R6)
Full paper →-
In the given nuclear reaction, the element X is :
\({}^{22}_{11}\text{Na} \rightarrow X + e^{+} + \nu\)
-
A nucleus of mass number 189 splits into two nuclei having mass number 125 and 64. The ratio of radius of two daughter nuclei respectively is :
NEET UG 2021 question paper (official, booklet M4)
Full paper →-
A radioactive nucleus \(^A_ZX\) undergoes spontaneous decay in the sequence
\(^A_ZX \to {}_{Z-1}B \to {}_{Z-3}C \to {}_{Z-2}D\), where Z is the atomic number of element X. The possible decay particles in the sequence are :
-
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be :
NEET UG 2019 question paper (official, booklet P1)
Full paper →-
\(\alpha\)-particle consists of :
NEET UG 2018 question paper (official, booklet EE)
Full paper →-
For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is
NEET UG 2017 question paper (official, booklet B)
Full paper →-
Radioactive material 'A' has decay constant '8\(\lambda\)' and material 'B' has decay constant '\(\lambda\)'. Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material 'B' to that 'A' will be \(\frac{1}{e}\) ?
NEET UG 2016 Phase 2 question paper (official, booklet ZZ)
Full paper →-
The half-life of a radioactive substance is 30 minutes. The time (in minutes) taken between 40% decay and 85% decay of the same radioactive substance is