Chapter 27 Early Quantum Theory and Models of the Atom

Planck’s Quantum Hypothesis and
Blackbody Radiation
This spectrum could not be reproduced using the
physics known in the late 19 th ­ century.
A solution was proposed by Max Planck in 1900:
The energy of oscillations within atoms cannot have
an arbitrary value; it is related to the frequency:
The constant h is now called Planck’s constant.