1
JEE Main 2022 (Online) 28th July Evening Shift
Numerical
+4
-1

If the wavelength for an electron emitted from $$\mathrm{H}$$-atom is $$3.3 \times 10^{-10} \mathrm{~m}$$, then energy absorbed by the electron in its ground state compared to minimum energy required for its escape from the atom, is _________ times. (Nearest integer)

$$\left[\right.$$ Given $$: \mathrm{h}=6.626 \times 10^{-34} \mathrm{~J} \mathrm{~s}$$ ]

Mass of electron $$=9.1 \times 10^{-31} \mathrm{~kg}$$

2
JEE Main 2022 (Online) 26th July Evening Shift
Numerical
+4
-1

Consider an imaginary ion $${ }_{22}^{48} \mathrm{X}^{3-}$$. The nucleus contains '$$a$$'% more neutrons than the number of electrons in the ion. The value of 'a' is _______________. [nearest integer]

3
JEE Main 2022 (Online) 26th July Morning Shift
Numerical
+4
-1

The wavelength of an electron and a neutron will become equal when the velocity of the electron is $$x$$ times the velocity of neutron. The value of $$x$$ is ____________. (Nearest Integer)

(Mass of electron is $$9.1 \times 10^{-31} \mathrm{~kg}$$ and mass of neutron is $$1.6 \times 10^{-27} \mathrm{~kg}$$ )

4
JEE Main 2022 (Online) 25th July Evening Shift
Numerical
+4
-1

When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are _____________.