The degeneracy of a hydrogen atom whose energy equals $-R_{\mathrm{H}}$ / 16

If the de-Broglie wavelength of a particle is equal to $10 \sqrt{h / m}$, then what is the ratio of its speed to mass?

The degeneracy of hydrogen atom that has energy equal to $ \frac{-R_{\mathrm{H}}}{9} $ is (where, $ R_{\mathrm{H}}= $ Rydberg constant)

If the de-broglie wavelength of a particle of mass $ (m) $ is 100 times its velocity. Then, its value in terms of its mass $ (m) $ and plank constant $ (h) $ is