Flashcards
Science Unit 7 Waves Grade 8
Cards in this deck (43)
- 1What is a wave?a disturbance that travels through a medium transporting energy from one location to another location
- 2What is a medium?a substance or material in which something exists or occurs
- 3What are mechanical waves?waves that require a medium in which to travel, involves a transfer of kinetic energy from one place to another in the material
- 4What are transverse waves?for mechanical waves, waves in which the movement in the medium is perpendicular to the direction the wave is traveling
- 5What are longitudinal waves?for mechanical waves, waves in which the movement in the medium is parallel to the direction the wave is traveling
- 6What is a surface wave?wave that travels on the surface of the water in both transverse and longitudinal motions
- 7What are the portions of waves?
- 8What is frequency?a measure of how many wavelengths pass a given point per second
- 9What is a period?the time for a wave, or one cycle of a repeating wave, to pass a location
- 10Which type of wave carries the most energy?high frequency, short wavelength
- 11What is an electromagnetic wave?waves of energy travelling through space
- 12How are mechanical and electromagnetic waves similar?They both have the following properties:
• amplitude
• wavelength
• frequency - 13What is the difference between mechanical and electromagnetic waves?mechanical waves require a medium to transfer energy, electromagnetic waves do not
- 14How fast do electromagnetic waves travel?at a speed of about 300,000 km/s (186,000 mi/s)
- 15What is radiant energy?the energy transmitted by an electromagnetic wave
- 16What is the range, the entire range of electromagnetic radiation, from the longest wavelengths to the shortest wavelengths, of electromagnetic waves called?electromagnetic spectrum
- 17what are gamma raysThe shortest wave length of all waves on the electromagnetic spectrum
- 18Light Frequency Graph
- 19What is visible light?the small section of the electromagnetic spectrum that human eyes can detect
- 20What is transmission?the passing of light through an object or medium
- 21what is reflection?the process whereby light bounces back from an object at the same angle and intensity that the object received it
- 22What is absorption?the ability of light waves to be taken into an object or medium, rather than transmitted (passed through) or reflected (bounced off).
- 23What is white light?visible light that contains all of the colors of the visible spectrum
- 24What is a retina?the layer of cells at the back of the eye where light-sensitive cells are found
- 25What are photoreceptors?cells on the retina that detect different wavelengths of light and send these signals to the brain
- 26What are cones?special light-sensitive cells in the retina that allow us to see colors and fine details
- 27What are rods?cells in the retina that are sensitive to all light but do not distinguish color
- 28What is refraction?the change in direction of light when it goes from one medium into a different medium
- 29What is a medium?a substance or material in which something exists or occurs
- 30What is the angle of incidence?the angle a light ray approaching a surface or interface between two mediums makes with the line normal to the surface or interface, at the point the ray hits it
- 31What is the Law of Reflection?Angle of reflection = Angle of incidence
- 32What is a 'normal' line?a line that is perpendicular to a surface or interface
- 33What is the angle of reflection?the angle a light ray leaving a surface or interface between two mediums makes with the line normal to the surface or interface, at the point the ray hits it
- 34What causes light to change speed?change in direction
- 35What are transparent mediums?mediums that are able to let light pass through
- 36True or False Light speeds up after it leaves waterTrue
- 37what is the retina?The layer at the back of the eye where light-sensitive cells are found.
- 38What is refraction?the change in direction of light when it goes from one medium into a different medium
- 39What is a lens?a glass (or other) object that causes the refraction of light; a piece of clear glass with curved surfaces that can make an image look larger
- 40What is transparent?able to let light pass through
- 41Whats a concave lens?a smoothly curved, transparent object that is thicker at the edges than in the center
- 42what is a convex lens?a smoothly curved, transparent object that is thinner at the edges than in the center
- 43what is the cornea?The transparent part of the eye that covers the pupil and the iris.
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- Flashcards on Science Unit 7 Waves Grade 8, created by mellowsmiley122 on 24/04/2015.
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