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Questions and Answers
What happens when LEDs are 'forward biased'?
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?
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?
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?
What does the turn-on voltage of LEDs represent?
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Why do light-emitting diodes require a series load resistor?
Why do light-emitting diodes require a series load resistor?
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