Calculate the radius of the third orbit of $He^{+}$. (in $pm$)

Calculate the radius of the first orbit of $Li^{2+}$. (in $pm$)

In which orbit of the Bohr model of the hydrogen atom is the speed of the electron maximum?

If the radius of the second Bohr orbit of the $He^{+}$ ion is $105.8 \, pm$, what is the radius of the third Bohr orbit of the $Li^{2+}$ ion?

Which one of the following statements is not correct?

The energy of a photon of wavelength $(\lambda) = 1 \, m$ is (Planck's constant $= 6.626 \times 10^{-34} \, J \, s$,speed of light $= 3 \times 10^8 \, ms^{-1}$)