Level 2 1. Which is not true about electromagnetic waves? a. They can be seen with the bare human eye. b. They are all emitted from the Sun. c. They can be hamessed for power via solar panels. d. None of the above. 2. Which of the following regions has frequencies just slightly less than the visible region in the electromagnetic frequency. a. Infrared b. Gamma c. Microwave d. Radio waves 3. If an astronomical light source were moving toward us, what would be observed? a. Red shift b. Purple shift c. Blue shift d. Green shift 4. A sound with an intensity of 30 dB is how many times louder than the threshold of hearing? a. 10 b. 100 c. 1000 d. 10000

Electromagnetic waves carry a fascinating history, especially in the context of their discovery. In the 19th century, scientists like James Clerk Maxwell laid the groundwork by formulating the equations that describe electromagnetic fields. However, it was Heinrich Hertz who first experimentally demonstrated the existence of these waves in 1887, leading to a technological revolution that enabled radio communication, microwaves, and even today’s smartphones! In real-world applications, electromagnetic waves can be harnessed in countless innovative ways. For instance, solar panels utilize the visible light portion of the electromagnetic spectrum to convert sunlight into electricity. Similarly, infrared waves are used in remote controls and thermal imaging, while microwaves are common in cooking appliances. This versatility shows just how integral electromagnetic waves are to modern life!