1
NEET 2022 Phase 2
+4
-1

The ratio of Coulomb's electrostatic force to the gravitational force between an electron and a proton separated by some distance is 2.4 $$\times$$ 1039. The ratio of the proportionality constant, $$K = {1 \over {4\pi {\varepsilon _0}}}$$ to the gravitational constant G is nearly (Given that the charge of the proton and electron each = 1.6 $$\times$$ 10$$-$$19 C, the mass of the electron = 9.11 $$\times$$ 10$$-$$31 kg, the mass of the proton = 1.67 $$\times$$ 10$$-$$27 kg) :

A
10
B
1020
C
1030
D
1040
2
NEET 2022 Phase 1
+4
-1
Out of Syllabus

The graph which shows the variation of the de Broglie wavelength ($$\lambda$$) of a particle and its associated momentum (p) is

A
B
C
D
3
NEET 2022 Phase 1
+4
-1
Out of Syllabus

In the given nuclear reaction, the element X is

$${}_{11}^{22}Na \to X + {e^ + } + v$$

A
$${}_{11}^{23}Na$$
B
$${}_{10}^{23}Ne$$
C
$${}_{10}^{22}Ne$$
D
$${}_{12}^{22}Mg$$
4
NEET 2022 Phase 1
+4
-1

Let T1 and T2 be the energy of an electron in the first and second excited states of hydrogen atoms, respectively. According to the Bohr's model of an atom, the ratio T1 : T2 is

A
1 : 4
B
4 : 1
C
4 : 9
D
9 : 4
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