Quantization No nodes One node (x=4) 2 Lowest Energy Next Lowest Energy Two nodes (x=号，) Three nodes(x-4,是，) 。 Only certain wavefunctions are allowed solutions The“Quantum Number'”defines each wavefunction and its energy Π-13Quantization  Only certain wavefunctions are allowed solutions  The “Quantum Number” defines each wavefunction and its energy No nodes Lowest Energy Next Lowest Energy One node (x= ) d 2 Two nodes (x= , ) d 3 2d 3 Three nodes (x= , , ) d 4 3d 4 d 2 II-13