Blue LEDs. Since When is Improvement Invention?
C.Unique bat- friendly LEDs have been invented. D.Progress has been made in the sustainable project.4. Which of the following can be the best title for the text? A.New streetlights are used to help bats. B.The bat-friendly town turns the night red. C.Man can live together with bats...
2. What did Daan Roosegaarde do for his project? A.He invented low-cost pesticides.B.He came up with the design concept. C.He learned dancing skills in a college.D.He bought 5 acres of leeks from farmers. 3. Why are less pesticides needed on the crop with the lights alongside?
A decade ago, engineers invented a semiconductor crystal made of an aluminum compound that produced a much brighter red light. Around the same time, a Japanese engineer developed the first practical blue LED. This small advance had a huge impact because blue, green, and red LEDs can be combin...