<u>[Reflection]</u>
- This occurs when light bounces off a surface (reflection is when light bounces off of something, a medium, but doesn't go through.)
- Best with a smooth surface (it is easiest for light to bounce off when the surface is smooth)
- If not for this behavior, mirrors wouldn't work (mirrors use reflection, if they did not you would not be able to see your <em>reflection</em>)
<u>[Refraction]</u>
- Light moves from one medium to another (when light moves from one medium to another, it refracts)
- Lenses in your glasses to bend light waves (refraction is all about bending light waves, so this option falls under this category)
- Microscopes and telescopes take advantage of this behavior of light (again, refraction is bending light waves. When you bend a light wave, it can make it easier to see [larger, smaller, etc] so this option is refraction)
- Light wave changes speed (light does not change speed when being reflected because it is in the same medium and just bouncing, but it refraction is changes mediums so it will bend and change speed)
[Note]
- Some of these can be figured out by knowing the definitions. For example, refraction is defined as "change in direction ... of any wave as a result of its traveling at different speeds at different points along the wave front" (Oxf/ord Languages)
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather
I think Jupiter
Make as a abRainlist
Answer:
T_{1/2} = 5,776 10³ years
We see this life time as it is very close to the life time of carbon 14, so it could be used for dating ancient objects
Explanation:
The radioactive decay of described by an equation of the form
N = N₀ 
where N is the number of atoms present, N₀ is the number of initial atoms λ is the activity of the material.
The average life time is defined as the time for which the number of remainng atoms is N = N₀ / 2
= ln 2 /λ
With these expressions, the best method to determine the average life time is to find the activity of the first equation.
For this we look for a point on the graph as accurate as possible,
N₀ = 100, N = 30 and t = 10,000 years
we substitute in the equation
30 = 100 e^{-\lambda 10000}
ln 0.3 = - λ 10000
λ = - (ln 0.3) / 10000
λ = 1.2 10-4
now we can find the average life time
= ln 2 / 1,2 10-4
T_{1/2} = 5,776 10³ years
We see this life time as it is very close to the life time of carbon 14, so it could be used for dating ancient objects
Wherever the change in the body happened will detect the stimuli and send the signals to the brain and Spinal does
Answer: work
Explanation:
Often in physics, work is defined as the use of force to move an object. Technically, work is actually a change in energy caused by a force external to the system. The formula for work is W = F⊥d or W = FdcosΘ. Using this formula, we can see that work is just when a force is applied for a certain displacement. In simpler terms, that's just a force used to move an object a certain distance.
