If the radius of the 3^rd Bohr's orbit of hydrogen atom r₃ and the radius of 4^th Bohr's orbit is r₄. Then:

Angular momentum of electron in 3^rd stationary orbit of hydrogen atom is

For irreversible expansion of an ideal gas under isothermal condition, the correct option is:
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If radius of second Bohr orbit of the He?ion is 105.8pm, what is the radius of third Bohr orbit of Li²⁺ ion?
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Given below are two statements:
Statement I: Bohr's theory accounts for the stability and line spectrum of Li²? ion.
Statement II: Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field.
In the light of the above statements, choose the most appropriate answer from the options given below:
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The difference between the radii of 3rd and 4th orbits of Li²⁺ in ΔR₁.. The difference between the radii of 3rd and 4th orbits of He⁺ is ΔR₂. Ratio ΔR₁: ΔR₂ is: