Obtain the first Bohr radius of muonic hydrogen atom [i.e., an atom in which a negatively charged muon `(mu)` of mass about `207m_e` orbits around a proton].

The radius of first orbits of hydrogen atom is called Bohr radius. (True /false).

Fill ups: The radius of first orbit of hydrogen atom is called………………..radius.

Calculate the radius of third orbit of hydrogen atom. Compare it with the same radius of second Bohr orbit of singly ionised helium atom.

Calculate the frequency of rtevolution of electron in the first Bohr orbit of hydrogen atom,if the radius of the first Bohr orbit is 0.5 overset @A and the velocity of electron in the first orbit is 2.24 xx 10^6 m s^(-1) .

The gravitational attraction between electron and proton in a hydrogen atom is weaker than the coulomb attraction by a factor of about 10^ -40 . An alternative way of looking at this fact is to estimate the radius of the first Bohr orbit of a hydrogen atom if the electron and proton were bound by gravitational attraction. You will find the answer interesting.

Obtain an expression for energy of orbital electron in hydrogen atom using Bohr’s postulates.

Read the following statements and choose the correct option. (I) If the radius of the first Bohr orbit of hydrogen atom us redis of 2^(nd) orbit of Li^(2+) would be 4r (II) For s-orbital electron , the orbital angular momentum is zero

In 1959 Lyttleton and Bondi suggested that athe expansion of the Universe could be expalined if matter carried a net charge. Suppose that the Universe is made up of hydrogen atoms with a number density N, which is maintained a constant. Let the charge on the proton be: e_p = -(1+y)e , where e is the electronic charge. show that the velocity of expansion is proportional to the distance from the centre.

In 1959 Lyttleton and Bondi suggested that athe expansion of the Universe could be expalined if matter carried a net charge. Suppose that the Universe is made up of hydrogen atoms with a number density N, which is maintained a constant. Let the charge on the proton be: e_p = -(1+y)e , where e is the electronic charge. Find the critical value of y such that expansion may start.