Bad Qubits — Learn Quantum by Doing

Multiple choice

What assumption did Planck introduce to derive his blackbody formula and eliminate the ultraviolet catastrophe?

High-frequency electromagnetic waves travel slower than c, so they radiate less
The number of standing-wave modes between nu and nu+dnu decreases as nu^2
Each oscillator at frequency nu can exchange energy only in discrete packets of size h*nu, holding energy 0, h*nu, 2*h*nu, ...
Each oscillator carries the same average energy k_B*T regardless of frequency