Question | Answer |
a wave that can travel through empty space or matter and consists of changing electric and magnetic feilds | electromagnetic wave |
do electromagnetic waves require matter? | no |
an electric feild surrounds every --- object. | charged |
a magentic feild surrounds every ---. | magnet |
the transfer of energy as electromagnetic waves | radiation |
have scientists discovered something that travels faster than light? | no |
how fast does light travel? | 300,000 km/s |
what is the major source of energy on earth? | the sun |
all of the frequencies or wavelengths of electromagnetic radiation | electromagnetic spectrum |
visible light | light that you can see |
what is the order of the electromagnetic spectrum? | radio waves
microwaves
infrared waves
visible light
ultraviolet light
x rays & gamma rays |
AM= | amplitude modulation |
FM= | frequency modulation |
tv stations use --- for sound and --- for pictures. (AM or FM) | FM;AM |
microwaves are used to send things over --- distances | long |
what are somethings that involve microwaves? | radar, cell phones, microwaves |
what does the amount of infrared waves given off depend on? | temperature |
what is white light? | all of the colors combined |
longest wavelengths are seen as ---, and shortest wavelengths are seen as ---. | red ; violet |
what is the range of colors? | the visible spectrum |
ultaviolet light is produced by the ---. | sun |
what are some bad effects of ultraviolet light? | sunburn, skin cancer, wrinkles, damage to eyes |
what are some good effects of ultraviolet light? | kill bacteria on surgical tools, viatmin D |
can x-rays pass through some materials? | yes |
gamma rays can be used to treat --- | cancer |
when light waves bounce off of an object | reflection |
light reflects off of --- objects | all |
what is the law of reflection? | states that the angle of incidence is equal to the angle of reflection |
light beams reflect off all points at the same angle | regular reflection |
light beams hit and reflect at many different angles | diffuse reflection |
the transfer of energy carried by light waves to particles of matter | absorption |
the farther light travels from its source, the --- it becomes | dimmer |
an interaction of light with matter that causes light to change directions | scattering |
why is the sky blue? | blue light scatters more than anything else |
bending of a wave as it passes from medium to another | refraction |
what are the 2 types of lenses? | convex and concave |
the bending of waves around barriers or through opening | diffraction |
a wave interaction that happens when 2 or more waves overlap | interference |
what are the 2 types of interference? | constructive and destructive |
the passing of light through matter | transmission |
what are the 3 types of matter? | transparent, translucent, and opaque |
light reaches your eyes after being --- or ---. | reflected or transmitted |
in colored transparent objects, you see --- | the color of the object |
what are the primary colors of light? | red, blue, and green |
a material that gives a substance its color by absorbing some colors of light and reflecting others | pigment |
mixing pigments is called... | color subtraction |
what are the primary pigments? | yellow, cyan, and magenta |
light waves travel in all directions from their source in --- lines | straight |
a ray is the same as --- | an arrow |
a mirror that has a flat surface | a plane mirror |
an image through which light does not travel | virtual image |
a mirror that is curved inward | concave mirror |
an image through which light passes | real image |
make a --- to decide image concave forms. | ray diagram |
a mirror that curves outward | convex mirror |
a transparent object that forms an image by reflecting light | lens |
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