JEE Main 2017 (Online) 9th April Morning Slot | Atoms and Nuclei Question 201 | Physics

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

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

According to Bohr’s theory, the time averaged magnetic field at the centre (i.e. nucleus) of a hydrogen atom due to the motion of electrons in the n^th orbit is proportional to : (n = principal quantum number)

$${n^{ - 4}}$$

$${n^{ - 5}}$$

n^$$-$$3

n^$$-$$2

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