Answer with solution/ explanation

IV. PRE-TEST Directions: Read each question carefully. Choose the letter of the correct answer. 1. What EM wave make cellular telephones transmit and receive signals? a. radio waves c. visible light b. microwaves d. gamma rays 2. All of the following are uses of visible light. Which one is not? a. it enables us to see things c. for thermal imaging b. gives light to the screen of our devices d. used in optical fibers 3. Which kind of wave is use in night vision goggles? a. microwave c. gamma ray b. infrared d. visible light 4. Which of the following EM wave makes use of artificial lighting? a. visible spectrum C. gamma rays b. x-ray d. infrared 5. Which kind of wave causes the fluorescent chemicals to glow in sunlight? a. microwave c. gamma ray b. ultraviolet d. visible light 6. How many of the EM waves are visible? a. none out of seven EM waves c. all of the EM waves b. most of it d. only one out of seven EM waves 7. Among the following forms of the EM spectrum, which waves do not have enough energies to damage the body cells? a. gamma ray and infrared c. gamma ray and ultraviolet b. radio wave and visible light d. X-ray and ultraviolet 8. What kind of wave is very dangerous, but have been used to kill cancer cells? a. gamma rays c. radio waves b. infrared d. visible light 9. Which of the following sets of EM radiation can harm your body cells? a. gamma ray, ultraviolet ray, X-ray c. infrared, microwaves, ultraviolet b. light, ultraviolet, X-ray d. gamma ray, microwaves, infrared 10. What type of electromagnetic waves is used in RADAR? a. infrared rays c. radio waves b. microwaves d. ultraviolet raysV. ASSESSMENT ACTIVITY 1 Directions: On a separate sheet, answer the following activity. Look at the picture below, write the name of the correct Electromagnetic wave corresponding to the letters on the picture. You may refer your answer for numbers 1-7 from the box. A B C D E F G X ray radiowave gamma ray C Microwave ultraviolet infrared 4. D Visible light 5. E 6. F 7. G 8. What letter shows the lowest frequency? 9. What letter shows the shortest wavelength? 10. What letter shows the EM wave with the highest energy?POST TEST A. Directions: Unscramble the letters to form the correct words and write the appropriate word to complete the statements below on a separate sheet. 1. EM wave that can be seen by human eye is the ISVIELB HGLIT 2. is the only source of natural white light. UNS 3. Rainbow is formed when light at different angles. FRRETACS 4. is one of the artificial lights we use at night. LBUB In a rainbow, the color that bends the most is IVLTOE B. Directions: Write ULTRA if the statement is correct, and VIOLET if not. If the statement is incorrect, state reason or appropriately correct the statement. 6. Too much exposure to UV rays may increase the risk for skin cancer and cataracts. 7. Sunscreens protect our skin so we can stay under the sun all day. B. The higher the Sun Protection Factor (SPF) in a sunscreen, the higher the protection. 9. Sunglasses have UV coating that help block harmful rays from the sun. 10. It is good to avoid the sun entirely