LEDs and Planck's Constant Quiz
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Questions and Answers

What happens when LEDs are 'forward biased'?

  • They emit radiation (photons) of visible wavelengths (correct)
  • They stop emitting radiation
  • They convert electrical energy into thermal energy
  • They absorb radiation (photons) of visible wavelengths

    • What is the purpose of the lab activity described in the text?

  • To determine Planck’s constant by measuring the turn-on voltage of LEDs (correct)
  • To calculate the energy lost by an electron in LEDs
  • To measure the current-voltage curve of LEDs
  • To study the thermal energy supplied by LEDs

    • What is approximately equal to the energy of the emitted photon in LEDs?

  • hf
  • eVt (correct)
  • Maximum voltage
  • Thermal energy

    • What does the turn-on voltage of LEDs represent?

    <p>The minimum voltage required to cause current to flow and photons to be emitted</p> Signup and view all the answers

    Why do light-emitting diodes require a series load resistor?

    <p>To prevent thermal runaway and unlimited forward current</p> Signup and view all the answers

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