1
JEE Main 2020 (Online) 2nd September Morning Slot
+4
-1
The figure that is not a direct manifestation of the quantum nature of atoms is :
A
B
C
D
2
JEE Main 2020 (Online) 9th January Morning Slot
+4
-1
The de Broglie wavelength of an electron in the 4th Bohr orbit is :
A
2$$\pi$$a0
B
6$$\pi$$a0
C
8$$\pi$$a0
D
4$$\pi$$a0
3
JEE Main 2020 (Online) 8th January Evening Slot
+4
-1
The radius of the second Bohr orbit, in terms of the Bohr radius, a0, in Li2+ is :
A
$${{2{a_0}} \over 9}$$
B
$${{2{a_0}} \over 3}$$
C
$${{4{a_0}} \over 9}$$
D
$${{4{a_0}} \over 3}$$
4
JEE Main 2020 (Online) 8th January Evening Slot
+4
-1
Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (z), the sum of (x), (y) an (z) is :
A
3
B
1
C
4
D
2
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