1
AP EAPCET 2024 - 22th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The half-life period of a radioactive element $A$ is 62 years. It decays into another stable element $B$. An archaeologist found a sample in which $A$ and $B$ are in 1:15 ratio. The age of the sample is

A
248 years
B
186 years
C
124 years
D
310 years
2
AP EAPCET 2024 - 21th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
The electrostatic potential energy of the electron in an orbit of hydrogen is -6.8 eV . The speed of the electron in this orbit is ( $c$ is speed of light in vacuum)
A
$\frac{c}{137}$
B
$\frac{c}{274}$
C
$\frac{2 c}{137}$
D
$\frac{3 c}{137}$
3
AP EAPCET 2024 - 21th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
The surface areas of two nuclei are in the ratio $9: 25$. The mass number of the nuclei are in the ratio
A
$27: 125$
B
$9: 25$
C
$3: 5$
D
$1: 1$
4
AP EAPCET 2024 - 21th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
The ground state energy of hydrogen atom is -13.6 eV . The potential energy of the electron in this state is
A
27.2 eV
B
-27.2 eV
C
-13.6 eV
D
13.6 eV
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