In a hypothetical Bohr hydrogen, the mass of the electron is doubled. The energy, $E_0$ and the radius, $r_0$ of the first orbit, will be? ($a_0$ is the Bohr radius)

The following diagram indicates the energy levels of a certain atom when the system moves from $2E$ level to $E$, a photon of wavelength $\lambda$ is emitted. The wavelength of photon produced during its transition from $\frac{4E}{3}$ level to $E$ is

The energy levels of the hydrogen spectrum is shown in the figure. There are some transitions $A$,$B$, $C$, $D$ and $E$. Transition $A$, $B$ and $C$ respectively represent

In the given figure $D$ and $E$ respectively represent

,

The energy level diagram for a hydrogen-like atom is shown in the figure. The radius of its first Bohr orbit is