SCIENCE 2ND QUARTER

• Wave -disturbance in space, up and down. back and forth movement, one series of ridges that moves across the surface of a liquid
• Crest -highest point in a wave
• Trough -lowest point in a wave
• Amplitude -distance from the midpoint to the highest
• Frequency -number of waves produced in one secund
• Electromagnetic wave or Electromagnetic radiation -wave that is created as a result of vibrations between an electric. fields and magnetic field
• Oersted Discovery -changing electric field produces magnetic fields changing magnetic field is therefore produced around a vibrating change.
• Faraday's Discovery -changing magnetic field will produce electric field.
• Mechanical waves. -moves through medium
• Electromagnetic waves -do not require a medium to move through
• Matter Waves -electrons and particles.
• Radio waves -longest wavelengths of all electromagnetic waves. used to transmit data and have been used for all sorts of applications including radio, satellites, radar, and computer networks
• Microwaves -radio waves with wavelengths less than 30 cm higher frequency, shortest wavelength. useful in communication because they can penetrate clouds, smoke and light rain.
• Infrared waves -classified as "near" infrared or far" infrared, between microwaves and visible light, can be detected by heat and used in heat lamp.
• ultraviolet waves -next shortest wavelength after visible light, used in taining beds and sterilizing equipments.
• X-rays -high wave energy, to much exposure can damage the living tissue.
• Gamma Rays -highest energy electromagnetic waves, actually come from radioactive elements or stars
• Radio/Television signals -radio waves that are produced by making electrons vibrate
• Global Positioning System (GPS) -space-based navigation system that provides geographical position time info anywhere on or near the earth.
• Magnetic Resonance Imaging (MRI) -medical imaging technique that uses powerful magnets computers radio waves to make detailed pictures inside your body.
• Satellite communication -can penetrate earth's atmosphere.
• cellphone -Radio transmitter and receiver that uses microwaves.
• Microwave oven -penetrate & agitate water molecules within the food.
• Radar -detection system used to determine the range, angle or velocity of objects
• Remote Control -uses LED lights to transmit signals to control devices
• Infrared scanners -used to show the temperature variation of the body
• Night vision goggles -use thermal imaging technology to capture the infrared light being emitted as heat by objects in the field of view..
• VISIBLE LIGHT - Enables us to see things around us
• Ultraviolet B -radiation in sunlight interacts with a protein in the skin.
• GAMMA RAY -treat tumors and cancer through the process called radiotherapy.
• Percy Spencer -nag-inventing microwave
• Proponent of Radio waves -James Clerk Maxwell and Heinrich Hertz
• Microwaves -Jagadish Bose of Bangladesh.
• Infrared waves - Frederick William Herschel
• ultra violet rays -Johann Wilhelm Ritter
• velocity - speed of an object