Unit 3: Chapter 2 (M3 Class)

In physics, electromagnetic radiation consists of waves of the electromagnetic field, propagating through space, carrying electromagnetic radiant energy. ในทางฟิสิกส์ การแผ่รังสีแม่เหล็กไฟฟ้าประกอบด้วยคลื่นของสนามแม่เหล็กไฟฟ้า แพร่กระจายผ่านอวกาศ นำพาพลังงานการแผ่รังสีแม่เหล็กไฟฟ้า​

​Radio wave, wave from the portion of the electromagnetic spectrum at lower frequencies than microwaves. The wavelengths of radio waves range from thousands of metres to 30 cm.

​A microwave oven works by passing microwave radiation, usually at a frequency of 2450 MHz (a wavelength of 12.24 cm), through the food.

​Infrared (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with wavelengths longer than those of visible light. It is therefore invisible to the human eye. ... Black-body radiation from objects near room temperature is almost all at infrared wavelengths.

​is a part of invisible spectrum that reaches Earth from the sun. (of electromagnetic radiation) having a wavelength shorter than that of the violet end of the visible spectrum but longer than that of X-rays.

​X-rays are a type of radiation called electromagnetic waves. X-ray imaging creates pictures of the inside of your body. The images show the parts of your body in different shades of black and white.

A gamma ray, also known as gamma radiation, is a penetrating form of electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves and so imparts the highest photon energy.​

​The electromagnetic spectrum is the range of frequencies of electromagnetic radiation and their respective wavelengths and photon energies. สเปกตรัมแม่เหล็กไฟฟ้าคือช่วงความถี่ของการแผ่รังสีแม่เหล็กไฟฟ้าและความยาวคลื่นและพลังงานโฟตอนตามลำดับ

​The electromagnetic spectrum is the term used by scientists to describe the entire range of light that exists. From radio waves to gamma rays, most of the light in the universe is, in fact, invisible to us! Light is a wave of alternating electric and magnetic fields.

is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range.

​Radar is a detection system that uses radio waves to determine the distance, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.

​a device that receives television signals and reproduces them on a screen.

​a device that receives television signals and reproduces them on a screen.

An optical fiber (or fibre in British English) is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a means to transmit light

Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).

In electronics, a remote control or clicker^[1] is an electronic device used to operate another device from a distance, usually wirelessly. In consumer electronics, a remote control can be used to operate devices such as a television set, DVD player or other home appliance.

A thermographic camera (also called an infrared camera or thermal imaging camera or thermal imager) is a device that creates an image using infrared(IR)

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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.

An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation.

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Cosmic rays are high-energy protons and atomic nuclei that move through space at nearly the speed of light. The aurora borealis, also known as the northern lights, is a light phenomenon that occurs within the arctic regions of the earth. This natural light phenomenon is caused by the collision cosmic rays and the particles within the Earths upper atmosphere.

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