An electron has a de broglie wavelength equal to the diameter of a hydrogen atom in its ground state. what is the kinetic energy of the electron? how does this energy compare with the ground-state energy of the hydrogen atom?

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.