1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The binding energy per nucleon for $$\mathrm{C}^{12}$$ is $$7.68 \mathrm{~MeV}$$ and that for $$\mathrm{C}^{13}$$ is $$7.47 \mathrm{~MeV}$$. The energy required to remove a neutron from $$\mathrm{C}^{13}$$ is

A
$$7.92 \times 10^{-13} \mathrm{~MeV}$$
B
$$4.95 \times 10^{-13} \mathrm{eV}$$
C
$$7.92 \times 10^{-13} \mathrm{~J}$$
D
$$7.92 \times 10^{-19} \mathrm{~J}$$
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The distance of closest approach when an alpha particle of kinetic energy $$6.5 \mathrm{~MeV}$$ strikes a nucleus of atomic number 50 is

A
0.221 fm
B
1.101 fm
C
0.0221 fm
D
4.42 fm
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

If an electron in a hydrogen atom jumps from the third orbit to the second orbit, it emits a photon of wavelength $$\lambda$$. When it jumps from the second to the first orbit, the corresponding wavelength of the photon will be

A
$$ \frac{5 \lambda}{27} $$
B
$$ \frac{7 \lambda}{20} $$
C
$$ \frac{16 \lambda}{9} $$
D
$$ \frac{20 \lambda}{7} $$
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

An electron has a mass of $$9.1 \times 10^{-31} \mathrm{~kg}$$. It revolves round the nucleus in a circular orbit of radius $$0.529 \times 10^{-10} \mathrm{~m}$$ at a speed of $$2.2 \times 10^6 \mathrm{~ms}^{-1}$$. The magnitude of its angular momentum is

A
$$1.06 \times 10^{-34} \mathrm{Kg} \mathrm{m}^2 \mathrm{~s}^{-1}$$
B
$$1.06 \times 10^{-24} \mathrm{Kg} \mathrm{m}^2 \mathrm{~s}^{-1}$$
C
$$2.06 \times 10^{-34} \mathrm{Kg} \mathrm{m}^2 \mathrm{~s}^{-1}$$
D
$$2.06 \times 10^{-24} \mathrm{Kg} \mathrm{m}^2 \mathrm{~s}^{-1}$$
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