Light-Emitting Diodes Are Semiconductors That Emit Light When a Current

question 4

Multiple Choice

Light-emitting diodes are semiconductors that emit light when a current is passed through them. What is the key factor that must be changed to change the wavelength of the emitted light in an LED?

• A)the width of the valence band
• B)the width of the conduction band
• C)the width of the band gap
• D)the magnitude of the current
• E)the type of semiconductor (p vs.n)

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Definitions:

RAM

Random Access Memory, a type of computer memory that can be accessed randomly, used for storing data temporarily while a computer is running.

EEPROM

An Electrically Erasable Programmable Read-Only Memory, a type of non-volatile memory used in computers and other devices to store small amounts of data that must be saved when power is removed.

Filter Section

A part of a system designed to remove or block certain frequencies or types of data, often to clean or optimize the input or output.

Electrical Noise Interference

Disturbances in electrical signals caused by external sources that can disrupt or degrade the performance of electronic equipment.