Origins of the Photoelectric Effect

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Questions and Answers

Cine a observat pentru prima dată efectul fotoelectric?

  • Albert Einstein
  • Philipp Lenard
  • Heinrich Hertz (correct)
  • Wilhelm Hallwachs

Ce fenomen a demonstrat Wilhelm Hallwachs în 1888?

  • Energia electronilor emiÈ™i depinde de intensitatea luminii.
  • RadiaÈ›ia ultravioletă accelerează descărcările electrice.
  • Un material pierde sarcină electrică sub acÈ›iunea luminii ultraviolete. (correct)
  • Lumina este compusă din particule numite fotoni.

Care este relația propusă de Einstein pentru energia unui foton?

  • E=mâ‹…c^2
  • E=f/h
  • E=h/f
  • E=hâ‹…f (correct)

Cine a propus teoria fotonilor pentru explicarea efectului fotoelectric?

<p>Albert Einstein (D)</p> Signup and view all the answers

Care este una dintre aplicațiile principale ale efectului fotoelectric în domeniul securității?

<p>Utilizarea senzorilor optici pentru detectarea intrușilor. (B)</p> Signup and view all the answers

Ce material este utilizat de obicei în panourile solare pentru efectul fotoelectric?

<p>Siliciu (A)</p> Signup and view all the answers

Care dintre următoarele reprezintă o aplicație practică a efectului fotoelectric?

<p>Panouri solare (B)</p> Signup and view all the answers

Care este unitatea de măsură a constantei lui Planck?

<p>Joule·secundă (J·s) (A)</p> Signup and view all the answers

Flashcards

Who first observed the photoelectric effect?

Heinrich Hertz initially observed the photoelectric effect.

What phenomenon did Wilhelm Hallwachs demonstrate in 1888?

A material loses electric charge under the influence of ultraviolet light.

Einstein's equation for a photon's energy?

E = hâ‹…f, where E is energy, h is Planck's constant, and f is frequency.

Who proposed the photon theory for explaining the photoelectric effect?

Albert Einstein proposed the photon theory to explain how light causes electrons to be emitted.

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Security application of the photoelectric effect?

Optical sensors for intruder detection.

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Material used in solar panels for photoelectric effect?

Silicon is commonly used in solar panels for the photoelectric effect.

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Practical application of photoelectric effect?

Solar panels are a practical application of the photoelectric effect.

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Unit of measure for Planck's constant?

Joule·second (J·s).

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