1
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

In a nuclear reaction 2 deuteron nuclei combine to form a helium nucleus. The energy released in $$\mathrm{MeV}$$ will be: (Given mass of deuteron $$=2.01355 \mathrm{~amu}$$. and mass of helium nucleus $$=4.0028 \mathrm{~amu}$$.

A
24.3 MeV
B
2.262 MeV
C
22.62 MeV
D
0.0243 MeV
2
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A particle at rest decays in to two particles of mass $$m_1$$ and $$m_2$$ and move with velocities $$v_1$$ and $$v_2$$. The ratio of their de Broglie wave length $$\frac{\lambda_1}{\lambda_2}$$ is:

A
1 : 4
B
1 : 1
C
1 : 2
D
2 : 1
3
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The ground state energy of hydrogen atom is $$-13.6 \mathrm{~eV}$$. If the electron jumps from the $$3^{\text {rd }}$$ excited state to the ground state then the energy of the radiation emitted will be:

A
1.275 MeV
B
12.75 eV
C
12.75 J
D
12.75 MeV
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

In the head-on collision of two alpha particles $$\alpha_1$$ and $$\alpha_2$$ with the gold nucleus, the closest approaches are 31.4 fermi and 94.2 fermi respectively. Then the ratio of the energy possessed by the alpha particles $$\alpha_2 / \alpha_1$$ is:

A
$$1: 3$$
B
$$9: 1$$
C
$$3: 1$$
D
$$1: 9$$
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