Physics - Modern Physics Question with Solution | TestHub

$E_n=-13.6\left(\mu /m_e\right)Z^2/n^2\mathrm{eV}$. Doubling the orbiting mass nearly doubles the reduced mass $\mu$, so every level's magnitude doubles: ionisation energy and level gaps double. Radius $r\propto 1/\mu$ decreases (A false); speed $v=Z{e}^2/\left(2{\epsilon }_{0}nh\right)$ is mass-independent (C false).