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| why is the sky blue? |
sunlight reaches the earth's atmosphere and is scattered in all directions by the gases and particles in the air. blue light is scattered in all directions because it travels in shorter and smaller waves. |
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jnc Fri, 19 Mar 2010 01:01:30 GMT |
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| How do we know that we have been harmed by ultraviolet radiation? How can we protect ourselves from uv radiation? |
Tanning/sunburns
we can wear sunscreen or stay out of the sun for extended periods of time |
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jnc Fri, 19 Mar 2010 01:01:30 GMT |
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| list 5 harmful effects of radiation |
can cause cancer (UV-skin cancer), sun burns, nuclear bombs after effects, developmental problems for fetuses |
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jnc Fri, 19 Mar 2010 00:12:34 GMT |
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| list 5 benefits of radiation |
heat up things, tell if a bone is broken, check to see if there are tumors/problems with muscles, dry hair, radio |
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jnc Fri, 19 Mar 2010 00:10:09 GMT |
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| what do the terms 'high-level radiation" and "low level radiation" mean? |
high level radiation=lots of energy/high frequency
low level radiation=little energy/low frequency
exposure to high- level radiation can be harmful |
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jnc Fri, 19 Mar 2010 00:10:09 GMT |
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| put the colors in order from shortest wavelength to longest |
red, orange, yellow, green. blue, indigo, violet |
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jnc Fri, 19 Mar 2010 00:10:09 GMT |
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| list the types of radiation in order from longest wavelength and lowest amount of energy |
radio, microwave, infrared, visible light, ultraviolet, x-ray, gamma ray |
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jnc Fri, 19 Mar 2010 00:10:09 GMT |
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| how do microwaves relate to radio waves? |
it is a type of radio wave |
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jnc Fri, 19 Mar 2010 00:04:04 GMT |
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| How fast do waves travel? |
at the speed of light |
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jnc Fri, 19 Mar 2010 00:04:04 GMT |
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| Explain the relationship between wavelengths and frequencies. How does that relationship affect the level of radiation? |
Long wavelength=low frequency=low level of radiation
Short wavelength=high frequency=high level of radiation |
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jnc Fri, 19 Mar 2010 00:04:04 GMT |
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| Why do we have to go into space to observe the EM spectrum? |
electromagnetic radiation from space is unable to reach the surface of the earth except at a very few wavelengths, such as the visible spectrum, radio frequencies, and some ultraviolet wavelengths |
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jnc Fri, 19 Mar 2010 00:04:04 GMT |
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| What is radiation and what is it made up of? |
radiation=energy in the form of waves
radiation is made up of energy |
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jnc Thu, 18 Mar 2010 23:57:53 GMT |
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| EM spectrum |
an arrangement of waves based upon their wavelength and frequency |
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jnc Thu, 18 Mar 2010 23:57:53 GMT |
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| What levels of radiation do high and low wavelengths emit? Why? |
Long wavelength=low frequency=low levels of radiation
Short wavelength=high frequency=high levels of radiation |
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jnc Thu, 18 Mar 2010 23:57:53 GMT |
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| list several examples of visible light radiation |
fireflies, light bulbs, stars, rainbows |
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jnc Thu, 18 Mar 2010 23:57:53 GMT |
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