edurack

Nuclei: RE-NEET 2026

Easy· Radioactivity (Q-Value in Radioactive Decays)· +4 / −1

Consider the following nuclear reaction

^{238}\mathrm{U} \longrightarrow\, ^{234}\mathrm{Th} + \,^{4}\mathrm{He}

Take masses of

^{238}

U,

^{234}

Th and

^{4}

He as 238.050 u, 234.043 u and 4.003 u, respectively. The

Q

value for the reaction, in keV, is: [Given:

1\ \mathrm{u} = 931.5\ \mathrm{MeV\,c^{-2}}

]

Practise more Nuclei PYQs

The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to (116)^th of its initial value?
NEET 2023 · Easy
The energy required to break one bond in DNA is 10^-20 J. This value in eV is nearly :
NEET 2020 · Easy
The energy equivalent of 0.5 g of a substance is :
NEET 2020 · Easy
When a uranium isotope ^235_92U is bombarded with a neutron, it generates ^89_36Kr , three neutrons and :
NEET 2020 · Easy
In the given nuclear reaction, the element X is: ^22_11Na X + e^++
NEET 2022 · Medium
A nucleus of mass number 189 splits into two nuclei having mass number 125 and 64. The ratio of radius of the two daughter nuclei,…
NEET 2022 · Easy