Across
- 1. – What abbreviation lists the colors of the visible spectrum from red to violet?
- 4. Hertz – Who was the first scientist to demonstrate that electromagnetic waves exist through experiments?
- 6. – What is the term for when light bounces off a surface instead of passing through it?
- 8. (Radio-Frequency Identification) – What technology identifies and tracks items automatically using electromagnetic signals from tags?
- 10. Image – What type of image appears to be behind a mirror or lens, even though rays don’t actually meet?
- 11. – What imaginary line is drawn perpendicular to the surface where light strikes?
- 12. (Global Positioning System) – Which system relies on satellites to provide precise positioning and navigation anywhere on Earth?
- 14. – What is the bending of light as it passes from one material to another called?
- 15. Mirror – Which mirror has a completely flat reflective surface?
- 17. Rays – Which electromagnetic waves carry the most energy and have the shortest wavelength?
- 19. Ray – What do we call the light ray that arrives at a surface before bouncing off?
- 20. Isaac Newton – Which scientist proved that white light could be split into a rainbow of colors using a prism?
- 23. Image – What type of image is formed when light rays physically meet at a point?
- 24. – What kind of wave is emitted by warm objects and can be felt as heat?
- 26. (UV) – Which waves are shorter than visible light and can damage skin if overexposed?
- 28. Conrad Roentgen – Who discovered X-rays in 1895 while experimenting with cathode rays?
- 31. of Incidence – Which angle is measured between the incoming ray and the perpendicular line to the surface?
- 33. – What therapy uses intense radiation to destroy cancerous cells?
- 35. of Reflection – Which angle is measured between the reflected ray and the perpendicular line to the surface?
- 36. – Which high-energy electromagnetic waves are used to see bones and internal structures?
Down
- 2. of Refraction – What is the ratio that tells how much light slows down in a medium compared to a vacuum?
- 3. Density – Which property of a material affects how much it slows down light traveling through it?
- 5. Waves – Which part of the electromagnetic spectrum is commonly used for radio and TV transmissions?
- 7. Wave – Which type of wave doesn’t need a medium and can travel through a vacuum as well as air or water?
- 9. Light – What kind of light contains ultraviolet rays and makes certain materials glow under it?
- 10. Light – Which type of electromagnetic waves can humans perceive with their eyes?
- 13. Mirror – What kind of mirror is part of a sphere and has a curved surface?
- 14. Reflection – What type of reflection creates a clear image because it occurs on a smooth surface?
- 16. William Herschel – Who discovered radiation beyond the red part of the visible spectrum while experimenting with sunlight?
- 18. (Magnetic Resonance Imaging) – Which medical scan uses magnets and radio waves to create detailed internal body images?
- 21. Index – What is another term for index of refraction?
- 22. Ray – What is the name of the light ray that leaves the surface after bouncing?
- 25. Villard – Who first identified gamma radiation at the beginning of the 20th century?
- 27. Mirror – Which curved mirror bulges outward, like the back of a spoon?
- 28. Snell – Who formulated the law that links the angle of incidence to the angle of refraction?
- 29. – Which waves are used both in kitchen appliances for heating food and in radar detection systems?
- 30. Wilhelm Ritter – Who first detected radiation beyond the violet end of the visible spectrum in 1801?
- 32. Mirror – Which curved mirror bulges inward, like a cave or the inside of a bowl?
- 34. Reflection – What type of reflection happens when light scatters in multiple directions after hitting a rough surface?
- 37. Reflection – What is another name for reflection that produces a clear, mirror-like image?