Non-Visible Light

Non-visible light refers to the portions of the electromagnetic spectrum that are not visible to the human eye. While the visible light spectrum ranges from red (longer wavelengths) to violet (shorter wavelengths), non-visible light includes wavelengths both longer and shorter than the visible spectrum. Non-visible light includes ultraviolet (UV) light, infrared (IR) radiation, microwaves, and radio waves.

Ultraviolet (UV) Light

UV light has shorter wavelengths and higher energy than visible light. It is often divided into three categories: UV-A, UV-B, and UV-C. UV-A has the longest wavelengths and is the least harmful, while UV-B and UV-C have shorter wavelengths and can be more damaging to living organisms. UV light is commonly associated with causes of sunburn, skin cancer, and can be used for sterilization processes.

Infrared (IR) Radiation

IR radiation has longer wavelengths and lower energy than visible light. It is often felt as heat and is used in a variety of applications including thermal imaging, night vision technology, and in household remote controls. IR radiation is also emitted by warm objects and is used in technologies such as infrared saunas and heat therapy.

Microwaves

Microwaves have even longer wavelengths than infrared radiation and are used in various technologies such as microwave ovens, satellite communication, and radar. They are also used in wireless communication systems and are a form of non-ionizing radiation.

Radio Waves

Radio waves have the longest wavelengths and lowest energy in the electromagnetic spectrum. They are used for communication, including broadcasting radio and television signals, as well as in mobile phones, Wi-Fi, and other wireless technologies.

Study Guide

1. What is non-visible light?
2. What are the categories of UV light?
3. How does IR radiation differ from visible light?
4. What are some common uses of microwaves?
5. How are radio waves utilized in everyday life?

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