Question 6. Why does the author mention the process of electroluminescence in the passage?
A) To explain the disadvantages of LED lights
B) To provide background information on LED lights
C) To show the difference between LED lights and traditional light sources
D) To emphasize the high efficiency of LED lights
Question 7. Why does the author include the information about the average lifespan of an LED light in the passage?
A) To show the versatility of LED lights
B) To provide background information on LED lights
C) To emphasize the durability of LED lights
D) To compare LED lights to traditional light sources
Question 8. The word "electroluminescence" in the passage is closest in meaning to...
A) Electro-resistance
B) Electro-reflection
C) Electro-illumination
D) Electro-dissipation
Question 9. The word "semiconductor" in the passage is closest in meaning to:
A) A conductor
B) An insulator
C) A material with intermediate conductivity
D) A type of light
Question 10. Correct
A semiconductor is a material with electrical conductivity that is intermediate between that of a conductor and an insulator. It is used in devices such as LEDs to control the flow of electrical current and generate light.
Which of the sentences below best expresses the essential information in the following sentence? "LED lights are able to convert more of the electrical energy they receive into light energy, while traditional light sources such as incandescent bulbs and fluorescent tubes tend to produce more heat than light."
A) LED lights transform electrical energy into light, while traditional light sources emit more heat than light.
B) LED lights are efficient at converting electrical energy into light energy, while traditional light sources produce heat instead of light.
C) LED lights have the ability to turn electrical energy into light, while traditional light sources generate more heat and less light.
D) LED lights change electrical energy into light energy efficiently, while traditional light sources produce heat instead of light energy.