JEE Main 2018 (Online) 15th April Morning Slot | Atoms and Nuclei Question 220 | Physics

The energy required to remove the electron from a singly ionized Helium atom is $$2.2$$ times the energies required to remove an electron from Helium atom. The total energy required to ionize the Helium atom completely is :

$$20$$ $$eV$$

$$34$$ $$eV$$

$$79$$ $$eV$$

$$109$$ $$eV$$

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

Imagine that a reactor converts all given mass into energy and that it operates at a power level of 10⁹ watt. The mass of the fuel consumed per hour in the reactor will be : (velocity of light, c is 3×10⁸ m/s)

0.96 gm

0.8 gm

4 $$ \times $$ 10^$$-$$2 gm

6.6 $$ \times $$ 10^$$-$$5 gm

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

The acceleration of an electron in the first orbit of the hydrogen atom (n = 1) is :

$${{{h^2}} \over {{\pi ^2}{m^2}{r^3}}}$$

$${{{h^2}} \over {{8\pi ^2}{m^2}{r^3}}}$$

$${{{h^2}} \over {{4\pi ^2}{m^2}{r^3}}}$$

$${{{h^2}} \over {{4\pi }{m^2}{r^3}}}$$

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

Two deuterons undergo nuclear fusion to form a Helium nucleus. Energy released in this process is : (given binding energy per nucleon for deuteron = 1.1 MeV and for helium = 7.0 MeV)

30.2 MeV

32.4 MeV

23.6 MeV

25.8 MeV

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