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.

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

Write down the expression for the radii of orbits of hydrogen atom.Calculate the radius of the smallest orbit.

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.

The radius of the first electron orbit of a hydrogen atom is 0.5overset(@)A . The electron moves in this orbit with a uniform speed of 2.2xx10^(6)m.s^(-1). What is the magnetic field produced at the centre of the nucleus due to the motion of this electron?

What is Bohr's radius?

The energy of an electron in nth orbit of hydrogen atom is

State Bohr’s postulates for atomic modeland using them derive an expression for the radius of nth orbit in hydrogen atom and show that radii are in the ratio 1 : 4 : 9 :16 :..........