It takes nd/ (lambda*f) time or a short pulse of light to travel from one end of the glass to the other.
If we talk about free space, that is, vacuum, light travels at a speed of 3x10^8 m/s, yet inside a glass light travels at a speed of v= c/n, where v is the velocity of the light and n is the refractive index. Now,
v=d/t,
so t= d/v
t= d/ (c/n)= n*d/c
c= lambda*f
t= nd/(lambda*f)
here, d is the thickness of the block, t is the time required and c refers to speed of light.
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Answer:
D. Each region established its own ''iron curtain'' to protect its interests
Explanation:
After the World War II, Western and Eastern Europe quickly diverged because of their politics. While the West was promoting democracy and market economy, the East was promoting communism and command economy. The strategic interests were intermingled, which led to lot of tensions, so there was a sharp division with artificial political boundary that was separating the two. As both sides were trying to spread their ideologies, but were also afraid of the influence of their opponent, they set ''iron curtains'' resulting in isolation between the two on pretty much every level.
Hello there!
The American Academy of Pediatrics recommends adoptive parents to perform a complete medical examination of adoptive children.
The reason for that is that Adoptive Children frequently have health or psychological issues from the background where they come from. For adoptive parents to provide them with the best conditions and care possible, a thorough medical examination with specialists is recommended as soon as the child is at home.
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Answer:
<h2>C.
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Explanation:
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