Science

• Waves - disturbance or variation that caries energy and travel through space or a material called MEDIUM
• Electromagnetic waves - form of traveling electric and magnetic transverse waves
• Radio and tv waves - have the longest wavelength and lowest frequencies
• Microwave - radio waves of very short wavelength
• Infrared - waves that lie in the region beyond the end of the visible spectrum.
• Visible light - shortest wave present can be detected by the eye
• Ultraviolet light - Invisible radiation that lie beyond the violet end of the visible spectrum
• X-rays - can be penetrate through flesh but not bone
• Gamma rays - used in sterilizating medical instruments
• Radio waves - It is used in radio and television communication
• Microwaves - it is used in satellite television and communication
• Infrared wave - it is used in remote controls and household electrical appliance
• Visible light - it make things able to be seen
• Ultraviolet - use in sterilization
• X-ray - it is for medical use
• Gamma rays - it is used in medical treatment such as used for killing cancer cells
• Incident ray - is is the light coming from the source and it hits a surface
• Reflected ray - is the light that bounds and leave the surface
• Normal line - is the line perpendicular to the surface
• Virtual image - are basically image which cannot be visually project on a screen
• Conclusion - virtual virtual image are always on the opposite side of the mirror relative to the object
• Real image - are one you can project onto a screen
• Plane mirror - it is a common reflecting surface
• Concave mirror - is a curved mirror in which reflective surface bulge away from the light source
• Convex mirror - is a curved mirror in which the reflective surface bulge toward to the light surface
• Convex mirror - image are smaller and upright or erect
• Concave mirror - image are smaller or bigger inverted or upside down
• Refraction - is when wave speed up or slow down due to traveling in a different medium
• Magnifying glass - is a single positive lens that will add convergence to the visual system. As an object is brought near the eye the retinal image increase in size
• Compound microscope - it used to converging lenses with short focal length
• Telescope -allow us to see distant object. Its contain two converging lenses namely the object and the eyepiece
• Camera - is a box like device used for taking pictures
• Binoculars - consists of pair of telescopes mounted together each having an objective lens and an eye piece
• Endoscope - is a long flexible tube that is inserted in the body so that a doctor can observe internal passage such a person esophagus or intestine
• Spectrometer - use the principle of diffraction to create a spectrum of colors emitted by a light
• Overhead projector - has a mirror which focuses light from an intense source onto to a pair of converging lenses
• Periscope - is an optical device consisting of a tube attached to a set of mirrors or prism
• Interfermeter - is an optical device that use the concept of diffraction and interference to make precise measurement of very small distance
• EMF strands for - electromotive force the supplies energy to the motor
• Magnetic field - refers to the area around a magnet in which the effect of magnetism is felt