1
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 $$1.6 \times 10^{-27} \mathrm{~kg}$$ )

2
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 _____________.

3
JEE Main 2022 (Online) 28th June Morning Shift
Numerical
+4
-1

If the work function of a metal is 6.63 $$\times$$ 10$$-$$19J, the maximum wavelength of the photon required to remove a photoelectron from the metal is ____________ nm. (Nearest integer)

[Given : h = 6.63 $$\times$$ 10$$-$$34 J s, and c = 3 $$\times$$ 108 m s$$-$$1]

4
JEE Main 2022 (Online) 27th June Evening Shift
Numerical
+4
-1

Consider the following set of quantum numbers.

n 1 m$$_1$$
A. 3 3 $$-$$3
B. 3 2 $$-$$2
C. 2 1 +1
D. 2 2 +2

The number of correct sets of quantum numbers is __________.

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