1

JEE Main 2021 (Online) 27th July Evening Shift

Numerical

+4

-1

The K

[h = 4.14 $$\times$$ 10

_{$$\alpha$$}X-ray of molybdenum has wavelength 0.071 nm. If the energy of a molybdenum atoms with a K electron knocked out is 27.5 keV, the energy of this atom when an L electron is knocked out will be __________ keV. (Round off to the nearest integer)[h = 4.14 $$\times$$ 10

^{$$-$$15}eVs, c = 3 $$\times$$ 10^{8}ms^{$$-$$1}]Your input ____

2

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 ____

3

JEE Main 2021 (Online) 27th July Morning Shift

Numerical

+4

-1

Out of Syllabus

A radioactive sample has an average life of 30 ms and is decaying. A capacitor of capacitance 200 $$\mu$$F is first charged and later connected with resistor 'R'. If the ratio of charge on capacitor to the activity of radioactive sample is fixed with respect to time then the value of 'R' should be _____________ $$\Omega$$.

Your input ____

4

JEE Main 2021 (Online) 25th July Evening Shift

Numerical

+4

-1

From the given data, the amount of energy required to break the nucleus of aluminium $$_{13}^{27}$$Al is __________ x $$\times$$ 10

Mass of neutron = 1.00866 u

Mass of proton = 1.00726 u

Mass of Aluminium nucleus = 27.18846 u

(Assume 1 u corresponds to x J of energy)

(Round off to the nearest integer)

^{$$-$$3}J.Mass of neutron = 1.00866 u

Mass of proton = 1.00726 u

Mass of Aluminium nucleus = 27.18846 u

(Assume 1 u corresponds to x J of energy)

(Round off to the nearest integer)

Your input ____

Questions Asked from Atoms and Nuclei (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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