Electromagnetic Spectrum, quest
Identify the 7 main kinds of electromagnetic waves in order from lowest frequency to highest frequency.
The 7 main electromagnetic waves in order from lowest frequency to highest frequency: 1. radio waves 2. microwaves 3. infrared waves 4. light 5. ultraviolet waves (rays) 6. x-rays 7. gamma rays
When we see the color of an object, what are we seeing?
The color that is reflected off the object
Order of EM waves ... Longest to shortest #4
Visible
Which part of the EM spectrum can be seen with our eyes?
Visible light is a narrow portion of the spectrum
A green object is appears green because it ______ all colors except green
absorbs
How are radio waves used?
are used in television and radio broadcasting
How are ultraviolet rays helpful?
can be used to sterilize equipment (kill bacteria and other disease-causing organisms). also stimulate skin cells to produce Vit D, which is needed for the absorption of calcium by the body
How are ultraviolet waves dangerous?
cause sunburn, premature aging (wrinkles), increase the risk of skin cancer, weaken the immune system and harm our eyes.
Order of EM waves ... Longest to shortest #2
Microwave
What type of EM wave is given off by all objects?
All objects give off varying amounts of infrared radiation (which is detected as heat)
Each element gives off a unique set of wavelengths, like fingerprints that is called
Emissions spectrum
Order of EM waves ... Longest to shortest #7
Gamma
Describe the characteristics of x-rays. Include how they can be helpful & harmful.
Have a lower frequency than gamma rays but a higher frequency than ultraviolet waves. Helpful: used to see inside the bodies of living things or objects (ex: airport luggage) Harmful: damages healthy cells of an organism (a living thing)
What is the relationship between frequency and wavelength?
High frequency waves have short wavelength. Low frequency waves have long wavelengths.
As sounds get closer....the pitch gets
Higher
Which color of visible light has the highest frequency? Which has the lowest frequency?
Highest frequency - violet Lowest frequency -red
Order of EM waves ... Longest to shortest #3
Infrared
List the types of waves
Longitudinal, Transverse, Surface
Waves that travel through matter or medium
Mechanical Waves
Which EM wave has a frequency just higher than radio waves? How are these waves used?
Microwaves are high frequency radio waves. Microwaves are used to cook food and are used in RADAR technology.
Antinodes
Peak or trough of wave
Order of EM waves ... Longest to shortest #1
Radio
Which EM wave has the lowest frequency and longest wavelength?
Radio waves
In a prism, what light bends the least
Red
What are the primary colors
Red, Green, Blue
Identify the colors of visible light.
Red, orange, yellow, green, blue, indigo, violet
What medium does sound waves moves fastest through?
Solid
Optical Illusion
Something that deceives the eye
Waves that travel both parallel and perpendicular in direction
Surface waves
Order of EM waves ... Longest to shortest #5
Ultraviolet
What medium does electromagnetic waves moves fastest through?
Vacuum of Space
In a prism, what light bends the most
Violet
When you combine all colors of light you get ....
White
Order of EM waves ... Longest to shortest #6
X-ray
Describe the characteristics of gamma waves. Include how they are helpful & harmful.
have the highest frequency, shortest wavelength and therefore, carry the greatest amount of energy. -Source: certain radioactive elements & nuclear reactions -Helpful: used to kill cancer cells - Harmful: can alter or kill healthy body cells
trough
is the bottom of a wave.
wavelength
is the distance between one point of a wave to the same point in the next wave.
amplitude
is the maximum distance that matter is displaced from the resting position.
frequancy
is the number of waves per unit of time.
crest
is the top of a wave.
Nodes waves
point where waves meet at sea level
What is an electromagnetic wave?
wave that can travel through space (a vacuum) or through matter (a medium)
infrared
waves are often used in heat lamps.
electromagnetic
waves are produced by stars and galaxies.
radio
waves are transverse waves that disturb electromagnetic fields.
x-rays
waves are used to penetrate solids and are used in doctors offices and as airports.
ultraviolet
waves are utilized by insects to locate nectar
mechanical
waves disturb matter.
visible light
waves have a color spectrum known as ROYGBIV.
gamma
waves have the shortest wavelength and the hightest frequency.
longitudinal
waves occur when the medium is parallel to the distance of the wave.
transverse
waves occur when the motion of the medium is at right angles(perpendicular) to the direction of the wave.