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Physics · 2024 · 3 marks
CBSE 2024 · Region 3 · Set 1 · Q27
(a) Define atomic mass unit (u). (b) Calculate the energy required to separate a deuteron into its constituent parts (a proton and a neutron). Given:…
(a)
Define atomic mass unit (u).
(b)
Calculate the energy required to separate a deuteron into its constituent parts (a proton and a neutron). Given : \[\begin{aligned} & \mathrm{m}(\mathrm{D})=2.014102 \mathrm{u} \\ & \mathrm{~m}_{\mathrm{H}}=1.007825 \mathrm{u} \\ & \mathrm{~m}_{\mathrm{n}}=1.008665 \mathrm{u} \end{aligned} \]
Marking-scheme solution
\[\begin{array}{ll}
\text { (a) Definition of atomic mass unit (u) } & 1 \\
\text { (b) Calculation of energy required } & 2 \\
\hline
\end{array}
\]
(a)
atomic mass unit (u) is defined as \(\displaystyle 1 / 12^{\text {th }}\) of the mass of the carbon \(\displaystyle \left({ }^{12} \mathrm{C}\right)\) atom.
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CBSE Class 12 Physics past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.