Freeze-guard: lesson, overview and topic-challenge pages

65 new guarded copies (Ch 10-14). Not live, not yet reviewed by an independent checker. The five chapter-challenge pages are on the other preview (port 8890).

Ch 10 Wave Optics

02-wave-optics-10min (live copy)
02-wo-l1-wavefronts (live copy)
02-wo-l2-refraction-wavefronts (live copy)
02-wo-l3-interference (live copy)
02-wo-l4-ydse (live copy)
02-wo-l5-diffraction (live copy)
02-wo-l6-polarisation (live copy)
wo-l1-wavefronts-topic-challenge (v3 build)
wo-l2-reflection-refraction-wavefronts-topic-challenge (v3 build)
wo-l3-coherence-interference-topic-challenge (v3 build)
wo-l4-youngs-double-slit-topic-challenge (v3 build)
wo-l5-single-slit-diffraction-topic-challenge (v3 build)
wo-l6-polarisation-malus-topic-challenge (v3 build)

Ch 11 Dual Nature

03-dn-l1-electron-emission (live copy)
03-dn-l2-photoelectric-experiment (live copy)
03-dn-l3-einstein-equation (live copy)
03-dn-l4-photons (live copy)
03-dn-l5-de-broglie (live copy)
03-dual-nature-10min (live copy)
dn-l1-electron-emission-topic-challenge (v3 build)
dn-l2-photoelectric-experiment-topic-challenge (v3 build)
dn-l3-einstein-equation-topic-challenge (v3 build)
dn-l4-photon-topic-challenge (v3 build)
dn-l5-de-broglie-topic-challenge (v3 build)

Ch 12 Atoms

04-at-l1-alpha-scattering (v3 build)
04-at-l2-closest-approach (v3 build)
04-at-l3-bohr-model (v3 build)
04-at-l4-spectral-series (v3 build)
04-at-l5-de-broglie-bohr (v3 build)
04-atoms-10min (v3 build)
at-l1-alpha-scattering-topic-challenge (v3 build)
at-l2-closest-approach-topic-challenge (v3 build)
at-l3-bohr-model-topic-challenge (v3 build)
at-l4-spectral-series-topic-challenge (v3 build)
at-l5-de-broglie-bohr-topic-challenge (v3 build)

Ch 13 Nuclei

05-nu-l1-composition (v3 build)
05-nu-l2-size-density (live copy)
05-nu-l3-binding-energy (v3 build)
05-nu-l4-force-fission (live copy)
05-nu-l5-fusion (live copy)
05-nuclei-10min (v3 build)
nu-l1-composition-topic-challenge (v3 build)
nu-l2-size-density-topic-challenge (v3 build)
nu-l3-binding-energy-topic-challenge (v3 build)
nu-l4-force-fission-topic-challenge (v3 build)
nu-l5-fusion-topic-challenge (v3 build)

Ch 14 Semiconductors

06-sc-l1-valves-solids (live copy)
06-sc-l2-energy-bands (live copy)
06-sc-l3-intrinsic (live copy)
06-sc-l4-n-p-type (live copy)
06-sc-l5-pn-junction (live copy)
06-sc-l6-diode-vi (live copy)
06-sc-l7-rectifiers (live copy)
06-sc-l8-special-diodes (live copy)
06-sc-l9-logic-gates (live copy)
06-semiconductors-10min (live copy)
sc-l1-valves-solids-topic-challenge (v3 build)
sc-l2-energy-bands-topic-challenge (v3 build)
sc-l3-intrinsic-topic-challenge (v3 build)
sc-l4-n-p-type-topic-challenge (v3 build)
sc-l5-pn-junction-topic-challenge (v3 build)
sc-l6-diode-vi-topic-challenge (v3 build)
sc-l7-rectifiers-topic-challenge (v3 build)
sc-l8-special-diodes-topic-challenge (v3 build)
sc-l9-logic-gates-topic-challenge (v3 build)

GUARD-REPORT.md