1
MHT CET 2024 15th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A radioactive substance has half-life of 60 minute. During 3 hour, the amount of substance decayed would be

A
$8.5 \%$
B
$25 \%$
C
$12.5 \%$
D
$87.5 \%$
2
MHT CET 2024 15th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The ratio of the areas of the electron orbits for the second excited state to the first excited state for the hydrogen atom is

A
$3: 2$
B
$9: 4$
C
$16: 81$
D
$81: 16$
3
MHT CET 2024 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

In a hydrogen atom in its ground state, the first Bohr orbit has radius $r_1$. The electron's orbital speed becomes one-third when the atom is raised to one of its excited states. The radius of the orbit in that excited state is

A
$3 r_1$
B
$4 r_1$
C
$9 \pi_1$
D
$16 \mathrm{r}_1$
4
MHT CET 2024 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The angular momentum of the electron in the third Bohr orbit of hydrogen atom is ' $l$ '. Its angular momentum in the fourth Bohr orbit is

A
$4 l$
B
$\frac{4}{3} l$
C
$\frac{5}{4} l$
D
$\frac{3}{2} l$
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