## Search found 44 matches

May 24th, 2019, 7:42 am
Forum: General Competition
Topic: Favorite Event?
Replies: 321
Views: 28972

### Re: Favorite Event?

It's About Time! Any event with an engaging but weirdly niche set of knowledge is what I'm about.
May 24th, 2019, 7:40 am
Forum: General Competition
Topic: Getting clapped on an event
Replies: 23
Views: 2935

### Re: Getting clapped on an event

Half of my Fermi experiences were getting clapped while the other half were getting clapped for. You never know what kind of day it's going to be.
May 21st, 2018, 9:01 pm
Forum: 2018 Nationals
Topic: Nationals Event Discussion
Replies: 83
Views: 16755

### Re: Nationals Event Discussion

Astronomy (3): 9/10. Nothing out of the ordinary for nationals tests. Awesome team of test writers, interesting questions, moderately difficult DSOs and general knowledge, interesting physics. I think that the physics could be a bit harder or the test a bit longer, but generally they do a pretty go...
May 15th, 2018, 4:22 am
Forum: 2018 Question Marathons
Topic: Fermi Questions C
Replies: 175
Views: 44493

### Re: Fermi Questions C

What is the 273rd Fibonacci number? To clarify, 0 will be considered the first Fibonacci number. Attempt|Using an approximation which I will not disclose, it's RIGHT on the edge between 56 and 57, but I'll say 57. Answer|Using an online calculator, the 273rd Fibonacci number is 5.06*10^56, so yes. ...
May 14th, 2018, 10:55 am
Forum: 2018 Question Marathons
Topic: Fermi Questions C
Replies: 175
Views: 44493

### Re: Fermi Questions C

Wait a screwed up the question. It is E0 but I should've said something like 3000 where the new mass is around E22 and radius is 1000 where the gravitational force is E1 stronger while on the surface I feel like this is being overthought. According to the shell theorem (essentially Gauss's law), th...
March 14th, 2018, 2:14 pm
Forum: 2018 Question Marathons
Topic: Remote Sensing C
Replies: 20
Views: 3651

### Re: Remote Sensing C

How does synthetic aperture radar (SAR) work? Why is it used so frequently? In what applications is it used?
March 8th, 2018, 5:17 am
Forum: 2018 Question Marathons
Topic: Fermi Questions C
Replies: 175
Views: 44493

### Re: Fermi Questions C

How many walnuts are produced in the state of California in the last decade(2007-2017)? Attempt|Okay. Given that I know nothing about the space required for walnuts to be grown or how long it takes to grow each one, I'll work off of more a demand => supply model. I'll start off by assuming that mos...
March 7th, 2018, 3:58 pm
Forum: 2018 Question Marathons
Topic: Optics B/C
Replies: 66
Views: 9762

### Re: Optics B/C

Answer:|Compton scattering is scattering of a photon from a charged particle (usually an electron) . It is inelastic: the energy of the photon is decreased after the scattering, since some of the energy goes into recoil of the electron. The electron is treated as free or loosely bound in the math f...
March 4th, 2018, 4:05 pm
Forum: 2018 Question Marathons
Topic: Optics B/C
Replies: 66
Views: 9762

### Re: Optics B/C

What is Compton scattering? Is it elastic or inelastic? What general type of EM radiation does it affect? Describe the mechanism by which it functions.
March 2nd, 2018, 5:46 am
Forum: 2018 Question Marathons
Topic: Optics B/C
Replies: 66
Views: 9762

### Re: Optics B/C

What is the primary difference between gamma and X rays? (Don't say wavelength/frequency/energy since there isn't a defined boundary between gamma and X rays there) Gamma rays are produced by nuclear processes (like nuclear decay) and particle interactions (like annihilation of particle-antiparticl...