1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0
What are the Principal & Azimuthal quantum number values of the valence electrons in tripositive Lutetium?

A
$$ \mathrm{n}=4 \quad \& \quad 1=2 $$
B
$$ \mathrm{n}=5 \quad \& \quad 1=2 $$
C
$$ \mathrm{n}=5 \quad \& \quad 1=3 $$
D
$$ n=4 \quad \& \quad 1=3 $$
2
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Bohr's radius of 2 nd orbit of $$\mathrm{Be}^{3+}$$ is equal to that of

A
4th orbit of hydrogen
B
2nd orbit of $$\mathrm{He}^{+}$$
C
$$3 \mathrm{rd}$$ obit of $$\mathrm{Li}^{2+}$$
D
1st orbit of hydrogen
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The ion that is isoelectronic with $$\mathrm{CO}$$ is

A
$$\mathrm{O}_2^{+}$$
B
$$\mathrm{CN}^{-}$$
C
$$\mathrm{O}_2^{-}$$
D
$$\mathrm{N}_2^{+}$$
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A proton having mass equal to $$1.66 \times 10^{-27} \mathrm{~kg}$$ is accelerated to one tenth of the velocity of light. If its velocity can be measured to an accuracy of $$\pm 2 \%$$, what would be the uncertainty in its position?

A
$$7.9 \times 10^{-5} \mathrm{~m}$$
B
$$5.29 \times 10^{-14} \mathrm{~m}$$
C
$$6.0 \times 10^{-5} \mathrm{~m}$$
D
$$1.06 \times 10^{-13} \mathrm{~m}$$
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