Question

which of the following light sources is the most efficient? select one: a. sodium vapor b. led c. candle d. incandescent

Explanation:

To determine the most efficient light source, we analyze each option:

• Option a (sodium vapor): These are efficient but not as much as LEDs. Sodium vapor lamps are often used for street lighting but convert less energy to visible light compared to LEDs.
• Option b (LED): Light - Emitting Diodes (LEDs) are known for their high efficiency. They convert a large percentage of the electrical energy they consume into visible light, with very little energy wasted as heat.
• Option c (candle): Candles are very inefficient. Most of the energy from the burning wax is converted into heat, and only a small fraction is converted into visible light.
• Option d (incandescent): Incandescent bulbs work by heating a filament until it glows. A large portion of the electrical energy is wasted as heat, and only a small amount is converted into light, making them much less efficient than LEDs.

Answer:

b. LED