Question 1 :
The radius of the second Bohr orbit for hydrogen atom is:<div><br/>[Given: Planck's const. $h = 6.6262\times 10^{-34}Js$; mass of electron $= 9.1091\times 10^{-31}kg$; charge of electron, $e=1.60210\times 10^{-19}C$; permittivity of vacuum, $\varepsilon&#160;_0=8.854185\times 10^{-12}kg^{-1}m^{-3}A^2$]<br/></div>

Question 2 :
The energy of the second Bohr orbit in the hydrogen atom is $-3.41\ eV$. The energy of the second Bohr orbits of $He^+$ ion would be:

Question 3 :
The angular speed $(\omega)$ of an electron revolving in $n^{th}$ Bohr orbit and corresponding principal quantum number(n) are related as ____________.

Question 4 :
According to the Bohr model of the atom, which electron transition will emit the lowest energy photon?

Question 5 :
For the energy levels in an atom which one of the following statements is(are) correct?

Question 6 :
What is likely to be principal quantum number for a circular orbit of diameter 20 nm of the hydrogen atom, if we assume Bohr orbit be the same as that represented by the principal quantum number?

Question 7 :
The two electrons have the following sets of quantum numbers.<br/>X: 3, 2, -2, +1/2<br/>Y: 3, 0, 0, + 1/2<br/>What is true of the following?

Question 8 :
The approximate value of quantum number $'n\ '$ for the circular orbit of hydrogen of $0.0001\space mm$ in diameter is

Question 9 :
The energy required for removal of electron from $3s, 3p, 3d$ subshells of hydrogen atom will lie in following sequence:<br>${ E }_{ 1 }=\left( 3s\longrightarrow \infty \right) { E }_{ 2 }=\left( 3p\longrightarrow \infty \right) { E }_{ 3 }\left( 3d\longrightarrow \infty \right) $

Question 10 :
For which of the following, the radius will be same as for hydrogen atom having $n=1$?