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Home Q & A Board Science-Related Homework Help Physics Astronomy
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Thisisdumb Thisisdumb
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6 years ago
If we imagine that 1 in 10 million stars would eventually give rise to a civilization on an orbiting planet and assuming that there are 100 billion stars in our Milky Way galaxy, how often should a civilization randomly appear over a 5 billion year
 
  period? A) once every 50 million years
  B) once every 50,000 years
  C) once every 500,000 years
  D) once every 5 million years

Question 2

Rayleigh scattering would have 400. nm light be scattered how many times as much as 800. nm light?
 
  A) 32
  B) 4
  C) 8
  D) 2
  E) 16

Question 3

A proton (1.67  10-27 kg) is accelerated to 99.8 the speed of light. How much energy did the accelerator have to impart?
 
  A) 14.8 GeV
  B) 13.9 GeV
  C) 38.9 GeV
  D) 7.52 GeV
  E) 223. GeV

Question 4

Discuss what observations convinced Rutherford that the nucleus was very small and dense.
 
  What will be an ideal response?

Question 5

What is the Brewster's angle for light traveling in vacuum and reflecting off a piece of glass of index of refraction 1.52?
 
  A) 48.9
  B) 33.3
  C) 48.1
  D) 56.7
  E) 41.1
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EEEEEricaEEEEErica
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6 years ago
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Thisisdumb Author
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6 years ago
Thank you, thank you, thank you!
kaytee23
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Yesterday
Helped a lot
brina10
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2 hours ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
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