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1
AP EAPCET 2024 - 20th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The speed of the electron in a hydrogen atom in the $n=3$ level is

(Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$ )

A
$62 \times 10^5 \mathrm{~ms}^{-1}$
B
$3.7 \times 10^5 \mathrm{~ms}^{-1}$
C
$7.3 \times 10^5 \mathrm{~ms}^{-1}$
D
$1.6 \times 10^5 \mathrm{~ms}^{-1}$
2
AP EAPCET 2024 - 20th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

One mole of radium has an activity of $\frac{1}{3.7}$ kilo curie. Its decay constant is

(Avagadro number $=6 \times 10^{23} \mathrm{~mol}^{-1}$ )

A
$\frac{1}{6} \times 10^{-10} \mathrm{~s}^{-1}$
B
$10^{-10} \mathrm{~s}^{-1}$
C
$10^{-11} \mathrm{~s}^{-1}$
D
$10^{-8} \mathrm{~s}^{-1}$
3
AP EAPCET 2024 - 20th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
$\mu$-meson of charge $e$, mass $208 m_e$ moves in a circular orbit around a heavy nucleus having charge $+3 e$. The quantum state $n$ for which the radius of the orbit is same as that of the first Bohr orbit for hydrogen atom is (approximately]
A
$n=20$
B
$n=25$
C
$n=28$
D
$n=29$
4
AP EAPCET 2024 - 20th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
A nucleus with atomic mass number $A$ produces another nucleus by loosing 2 alpha particles. The volume of the new nucleus is 60 times that of the alpha particle. The atomic mass number $A$ of the original nucleus is
A
228
B
238
C
248
D
244
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