22. What is the main source of UV light?, C. Sun , A. Fluorescent light D. UV lamp , B. Incandescent light , 23. Satellite Communication is an application of what type of wave? , A. Infrared C Radio wave. , B. Microwave D. X-ray , 24. Which of the following forms of electromagnetic waves is used in sterilization of medical equipment? , A. Gamma ray C. Ultraviolet , B. Microwave D. X-ray , 25. What light is produced from heat? , A. Fluorescent light C. Neon lights , B. Illuminated light D. Incandescent light , 26. The photosynthesis is a process by which green plants make food. This process used what type of EM waves? , A. Gamma ray C. Ultraviolet , B. Microwaves D. Visible light , 27. What form of EM wave is useful in diagnosing bone fracture and Tumors? , A. Gamma ray C. Visible light , B. UV light D. X-ray , 28. Which EM wave is emitted by stars and some radioactive substances? , A. Gamma ray C. Visible light, B. UV light D. X-ray , 29. Which type of EM wave is also called the penetrating radiation? , A. Microwave C. UV light , B. Radio wave D. X-ray , 30. What form of EM wave that is useful in nuclear engineering? , A. Gamma ray C. UV light , B. Microwave D. X-ray