1. He discovered radio waves in 1887. 2. It allows us to locate positions within 10m to 100m accuracy. 3. He discovered microwaves in 1864. 4. It uses heat of the microwaves to shrink and destroy tumors. 5. It means "below red”. 6. It is discovered by Johann Wilmer Ritter. 7. It is the major source of UV rays. 8. It is sometimes called Roentgen rays. 9. He discovered gamma rays in 1900. 10. It given off materials like cobalt-60 and cesium-137.
​