1
NEET 2022 Phase 2
+4
-1
Out of Syllabus

At any instant, two elements X1 and X2 have same number of radioactive atoms. If the decay constant of X1 and X2 are 10 $$\lambda$$ and $$\lambda$$ respectively, then the time when the ratio of their atoms becomes $${1 \over e}$$ respectively will be :

A
$${1 \over {5\lambda }}$$
B
$${1 \over {11\lambda }}$$
C
$${1 \over {9\lambda }}$$
D
$${1 \over {6\lambda }}$$
2
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
3
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
4
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
$${}_{12}^{22}Mg$$
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