Term
| What are three ways microwaves are used? |
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Definition
- To send info. over long distances
- They are used in radar
- Carrying signals sent between Earth and artificial sattelites in space
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Term
| In a microwave oven, the microwaves are created by a device called a ___________, which accelerates charged particles. |
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Definition
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Term
| What does Radar stand for? |
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Definition
| Radio Detection And Ranging |
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Term
| In addition to checking the speed of a car, what are two other ways radar is used? |
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Definition
- To watch the movement of airplanes
- To help ships navigate at night
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Term
| What ways are the frequencies and wavelentghs of a microwave different from radio waves? |
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Definition
| Microwaves have shorter wavelengths and higher frequencies. |
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Term
| In what ways are the frequences and wavelengths of infrared waves different from those of microwaves? |
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Definition
| Infrared waves have shorter wavelengths and higher frequencies |
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Term
| How are infrared waves able to make your skin warmer? |
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Definition
| Your skin absorbs infrared waves striking your body. The energy of the waves causes your skin to vibrate. Thus, making it warmer. |
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Term
| Name three sources of infrared waves. |
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Definition
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Term
| What does the amount of infrared waves that an object gives off depend on? |
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Definition
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Term
| The very narrow range of wavelength and frequencies in the electromagnetic spectrum that humans can see is_________. |
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Definition
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Term
| In what ways are the wavelengths and frequencies of visible light differrent from those of infrared waves? |
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Definition
| They have shorter wavelengths and higher frequencies |
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Term
| What color has the longest wavelengths of visible light? |
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Definition
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Term
| What color has the shortest wavelengths of visible light? |
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Definition
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Term
| The range of colors of visible light is called the _________. |
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Definition
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Term
| What does each letter in the name Roy G Biv stand for? |
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Definition
R- red
O- orange
Y- yellow
G- green
B- blue
I- indigo
V- violet |
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Term
| What can cause all the colors of visible light to be seen in a rainbow? |
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Definition
| Water droplets seperate white light into visible light of different lengths |
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Term
| In what way are the wavelengths and frequencies of ultraviolet light different from those of visible light? |
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Definition
| They have shorter wavelengths and higher frequencies |
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Term
| What kind of light can a bee see that you cannot see? |
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Definition
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Term
| Inn what way is ultraviolet light similar to visible lighth? |
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Definition
| Both are kinds of electromagnetic waves |
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Term
| The entire range of EM waves is called the __________. |
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Definition
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Term
| How is the speed of a wave determined? |
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Definition
| The speed of a wave is found by multiplying its walelenght by its frequency |
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Term
| Name and arrange the seven kinds of EM waves in order from long wavelength to short wavelength. |
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Definition
- Radio waves
- Microwaves
- Infrared light
- Visible light
- Ultraviolet light
- X Rays
- Gamma rays
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Term
| Waves used for broadcastingradio signals are called ________ |
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Definition
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Term
How are radio signals broadcast?
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Definition
- A radio station converts sound into an electric current. The current produces radio waves that are sent out in all direstionsby the antenna.
- A radio recieves radio waves and then converts them into an electric current, which is then converted into sound.
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Term
| Changing the amplitude or frequency of waves is called __________ |
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Definition
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Term
| Why can AM waves travel a longer distance than FM waves? |
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Definition
| AM radio waves can bounce off the atmosphere. |
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Term
| What kind of radio waves are used for TV to carry sound? |
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Definition
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Term
| What kind of radio waves are used for TV to carry pictures? |
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Definition
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Term
| Why do FM stations sound better than AM stations |
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Definition
| FM radio waves are less affdected by electrical noise |
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Term
| How are cable TV signals sent to TVs in homes? |
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Definition
| Some waves carrying television signals are transmitted to artificial sattelites orbitting Earth. The waves are amplified and sent to ground antennas. The then travel through cables to TVs in homes. |
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Term
| Name two things that produce light. |
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Definition
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Term
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Definition
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Term
| How is light differrent from other kinds of waves? |
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Definition
| Other kinds of waves, like ocean waves or sound waves, must travel through matter. Light does not need to |
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Term
| A wave that consists of changing eletric an dmagnetic feilds and that can travel through empty space is a(n) _____________ |
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Definition
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Term
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Definition
| Fields exist around certain objects |
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Term
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Definition
| They exert a force on another object without touching the object |
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Term
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Definition
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Term
| Every charged object is surrounded by a(n) __________ __________. |
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Definition
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Term
| An electric field pulls ______________ objects toward it and repels ___________________ objects |
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Definition
oppositely charged
like-charged |
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Term
Every magnet is surrounded by
a(n) ________________. |
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Definition
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Term
| How is an EM wave produced? |
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Definition
| An EM wave can be produced by the vibration of an electrically charged particle. |
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Term
| Where does the energy carried by an EM wave come from? |
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Definition
| An EM wave carries energy released by the original vibration of the particle |
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Term
| The transfer of energy as electromagnetic waves is _____________. |
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Definition
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Term
| How much faster does light travel than sound? |
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Definition
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Term
| What is the speed of light in the near vaccuum of space? |
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Definition
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Term
| How long does it take for light to travel from the sun to earth? |
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Definition
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Term
| _________________ from the sun are the major source of energy on Earth |
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Definition
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