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

The mass number of two nuclei $$\mathrm{P}$$ and $$\mathrm{Q}$$ are 27 and 125 respectively. The ratio of their radii $$R_P: R_Q$$ is given by:

A
9 : 25
B
3 : 5
C
27 : 25
D
5 : 3
2
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
3
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
4
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
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