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Physics
Quick fact
In a typical gas laser, only about 1% of the atoms are in the excited state at any time—yet that tiny fraction can create a powerful, focused beam because of population inversion.
Why this is interesting
You've seen lasers in barcode scanners and laser pointers, but have you ever wondered what makes laser light so special and powerful? The secret lies in a counterintuitive state called population inversion.
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Subjects · study & training · careers
Choose something you are considering. FACTREE will give you a clear picture of what it contains, how its main parts connect and where it could lead.
This private catalogue connects 31 subjects, study routes and careers across six broad areas. Public Maps and learner routes remain off.
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Open a subject to see its complete shape at a glance. You can always return here and choose something else.
See what programming involves, how its main areas connect, and whether you find the knowledge interesting enough to take it further.
Structuring the Programming Map…
Complete subject map
Move from the one-screen overview into all 19 areas. Open any area, compare possible Paths and return to the overview whenever you want.
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Curiosity quiz
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Administrator
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Knowledge architecture
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Curriculum coverage
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