1
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Consider an electron moving in the first Bohr orbit of a $$\mathrm{He}^{+}$$ ion with a velocity $$v_1$$. If it is allowed to move in the third Bohr orbit with a velocity $$v_3$$, then indicate the correct $$v_3: v_1$$ ratio.

A
3 : 1
B
2 : 1
C
1 : 3
D
1 : 2
2
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Which hydrogen like species will have the same radius as that of $$1^{\text {st }}$$ Bohr orbit of hydrogen atom?

A
$$ \mathrm{n}=2, \mathrm{Li}^{2+} $$
B
$$ \mathrm{n}=2, \mathrm{Be}^{3+} $$
C
$$ \mathrm{n}=2, \mathrm{He}^{+} $$
D
$$ \mathrm{n}=3, \mathrm{Li}^{2+} $$
3
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Two base balls (masses : m$$_1$$ = 100 g, and m$$_2$$ = 50 g) are thrown. Both of them move with uniform velocity, but the velocity of m$$_2$$ is 1.5 times that of m$$_1$$. The ratio of de Broglie wavelengths $$\lambda$$(m$$_1$$) : $$\lambda$$(m$$_2$$) is given by

A
4 : 3
B
3 : 4
C
2 : 1
D
1 : 2
4
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

The number of unpaired electron in Mn2+ ion is

A
2
B
3
C
5
D
6
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