Ljusets natur och egenskaper Flashcards by Oliver Karlsson

Q

Vad är ljus?

A

Elektromagnetisk våg & foton

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Q

Vad avgör färgen på ljus?

A

Våglängd eller frekvens

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Q

Vad är ljusets hastighet i vakuum?

A

c = 3,00×10⁸ m/s

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Q

Vad är en foton?

A

Ljuspartikel med energi

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Q

Fotonenergi formel?

A

E = h·f

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Q

Varför syns neonfärger så starkt?

A

Hög intensitet & kontrast

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Q

Hur skapas neonfärger?

A

Fluorescens / elektrisk excitering

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Q

Vilket ljus emitteras?

A

Synligt (400–700 nm)

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Q

Varför lyser de i UV-ljus?

A

Absorberar UV, emitterar synligt

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Q

Exempel på ljusövergång?

A

Elektroner → excitering → emission

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Q

Vad är neonljus?

A

Gasurladdningsrör med ädelgas

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Q

Varför olika färger?

A

Olika gaser (Ne, Ar, He)

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Q

Hur uppstår ljuset?

A

Elektroner exciterar gas → ljus

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Q

Är neonfärg samma som neonljus?

A

Nej, neonfärg = fluorescerande

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Q

Användning av neonprincip?

A

Skyltar, UV-effekter, konst

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