1

JEE Main 2022 (Online) 27th June Morning Shift

Numerical

+4

-1

A beam of monochromatic light is used to excite the electron in Li^{+ +} from the first orbit to the third orbit. The wavelength of monochromatic light is found to be x $$\times$$ 10^{$$-$$10} m. The value of x is ___________.

[Given hc = 1242 eV nm]

Your input ____

2

JEE Main 2022 (Online) 24th June Evening Shift

Numerical

+4

-1

A sample contains 10^{$$-$$2} kg each of two substances A and B with half lives 4 s and 8 s respectively. The ratio of their atomic weights is 1 : 2. The ratio of the amounts of A and B after 16 s is $${x \over {100}}$$. The value of x is ___________.

Your input ____

3

JEE Main 2021 (Online) 27th August Evening Shift

Numerical

+4

-1

X different wavelengths may be observed in the spectrum from a hydrogen sample if the atoms are exited to states with principal quantum number n = 6 ? The value of X is ______________.

Your input ____

4

JEE Main 2021 (Online) 27th July Morning Shift

Numerical

+4

-1

In Bohr's atomic model, the electron is assumed to revolve in a circular orbit of radius 0.5 $$\mathop A\limits^o $$. If the speed of electron is 2.2 $$\times$$ 16

^{6}m/s, then the current associated with the electron will be _____________ $$\times$$ 10^{$$-$$2}mA. [Take $$\pi$$ as $${{22} \over 7}$$]Your input ____

Questions Asked from Atoms and Nuclei (Numerical)

Number in Brackets after Paper Indicates
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