Calculate too:
Energy flow

Atomic shell

Wave-mechanical atomic model

v_n

m/s

h	J·s
6.626E-34

m_e	kg
9.109E-31

1. Define values of all variables, besides sought quantity
2. Change units if necessary
3. Click "Calculate"

		variables: λ - wavelength h - Planck's constant m_e - electron mass v_n - velocity of electron at nth stationary orbit