Homework HeLP

[Guest Science_Is_Fun]

Hi, I'm new to the board and I need some help with these two questions.

 

1. Explain why standing next to a warm thermal source is a good way to avoid mosquito bites.

 

2. Explain why decreases in the zone layer led Canadian scientists to develop a system for measuring the intensity of UV radiation at ground level. The UV index that accompanies most weather forecasts is the outcome of this system.

[DeoxyriboNucleicAcid]

#2:

Well, first of all, maybe it was a typo but i think you are taling about the Ozone layer

Anyway, they developed methods of measuring UltraViolet radiation levels at the surface because the Ozone is a layer in the atmosphere that bloks UV rays. UV rays are harmful for many organisms, as they can cause skin cancer for humans, and sunburn:)

So, since the layer of the atmosphere that protects us from these dangerouse rays is growing weeker, we must document how much UV hits the surface, 'cause if it hits the surface, it hits us!

UV rays can also be used to measure other scientific variables, and to make more inferences about weather, etc.

Hope that helps, and welcome to the forums!

[Cap'n Refsmmat]

For 1, mosquitos are attracted to heat and carbon dioxide, both of which you give off, but something that does it more than you (a fire) would distract the mosquito (and get him fried).

[Guest Science_Is_Fun]

I got some more questions....

 

1. Cardiologists who have access to cardiac imaging technology claim that one of the system's greatest strengths is that they can use a non-surgical technique to get in and out of the heart as quickly as possible. WHy are these characteristics so important?

 

2. Why are fetuses and infants much more readily harmed by ionizing radiation than adults?

 

3. WHy are x-rays not recommended for pregnant women?

 

4. Although ionizing radiation is hazardous, why is it misleading to say that all types of radiation are bad? Support your answer with examples.

[DeoxyriboNucleicAcid]

1: Imaging technology is great because cardiologists can see if there are any irregularities, problems, holes, damage, odd beat patterns, and MUCH MUCH MORE in the heart, without taking a scalpel and choping you open YOu can see the heart from all angles with sonar technology (what they put by pregnant womans stomaches to see the baby) andf you can even see inside the heart. It is perfct for diagnossing any disorder or disease.

 

2: I am not quite sure, but i think fetuses are over-sensitive to most things in the mother's body.

 

3: X-Rays are bad for pregnant woman because a fetus is very sensitive to radiation in high frequencies, like X-rays. The radiation may harm the fetus if it is not properly protected, when the mother has x-rays. The fetus may develop cancer, tomors, growth irregularities, die, orbasically become a mutant. ALL BECAUSE the X-rays alter DNA.

 

4: Not all radiation is bad. For example, humans NEED some radiation from the sun to survive. SOME solar radiation helps humans develop. It provides viteman D, which in the long run prevents depression, and helps bone growth, and overall health.

 

I hope that helps you