Astronomy C

Locked
User avatar
JCicc
Member
Member
Posts: 33
Joined: July 2nd, 2005, 4:18 pm
Division: C
State: PA
Location: About 8 kpc from Sgr A*
Has thanked: 0
Been thanked: 0

Re: Astronomy C

Post by JCicc » April 28th, 2013, 9:38 am

PM is fine, or you can post it right here. Whatever you prefer.

User avatar
JCicc
Member
Member
Posts: 33
Joined: July 2nd, 2005, 4:18 pm
Division: C
State: PA
Location: About 8 kpc from Sgr A*
Has thanked: 0
Been thanked: 0

Re: Astronomy C

Post by JCicc » April 28th, 2013, 7:20 pm

Southeastern PA regional exam is up on the test exchange.

lmatkovic3
Member
Member
Posts: 44
Joined: January 22nd, 2013, 7:49 pm
Division: Grad
State: GA
Location: Atlanta
Has thanked: 0
Been thanked: 0

Re: Astronomy C

Post by lmatkovic3 » May 3rd, 2013, 5:53 pm

Thanks again for the state test. My partner spent an hour doing it and two hours going over it, adding to our notes and whatnot. We did notice, however, a typo in the key. On question #45, the key says the answer is 1.5 magnitudes, but amplitude is defined as half the distance between crest and trough, so we think it should be ~.7 magnitudes.

syo_astro
Exalted Member
Exalted Member
Posts: 601
Joined: December 3rd, 2011, 9:45 pm
Division: Grad
State: NY
Has thanked: 0
Been thanked: 5 times
Contact:

Re: Astronomy C

Post by syo_astro » May 3rd, 2013, 5:57 pm

lmatkovic3 wrote:Thanks again for the state test. My partner spent an hour doing it and two hours going over it, adding to our notes and whatnot. We did notice, however, a typo in the key. On question #45, the key says the answer is 1.5 magnitudes, but amplitude is defined as half the distance between crest and trough, so we think it should be ~.7 magnitudes.
I guess maybe Cicc should explain his thoughts/whether you are right or not, but I thought since it was implying the whole pulsation sort of it was ~1.5.
B: Crave the Wave, Environmental Chemistry, Robo-Cross, Meteorology, Physical Science Lab, Solar System, DyPlan (E and V), Shock Value
C: Microbe Mission, DyPlan (Earth's Fresh Waters), Fermi Questions, GeoMaps, Gravity Vehicle, Scrambler, Rocks, Astronomy
Grad: Writing Tests/Supervising (NY/MI)

User avatar
JCicc
Member
Member
Posts: 33
Joined: July 2nd, 2005, 4:18 pm
Division: C
State: PA
Location: About 8 kpc from Sgr A*
Has thanked: 0
Been thanked: 0

Re: Astronomy C

Post by JCicc » May 3rd, 2013, 7:17 pm

I thought the amplitude for a cepheid was the difference in magnitude at maximum and minimum. I see what you are saying in terms of mechanical wave theory, but the only evidence I can provide is that delta Cep is described as having an amplitude of nearly 1 mag, and it ranges from about 3.6 to about 4.4.

lmatkovic3
Member
Member
Posts: 44
Joined: January 22nd, 2013, 7:49 pm
Division: Grad
State: GA
Location: Atlanta
Has thanked: 0
Been thanked: 0

Re: Astronomy C

Post by lmatkovic3 » May 3rd, 2013, 9:27 pm

JCicc wrote:I thought the amplitude for a cepheid was the difference in magnitude at maximum and minimum. I see what you are saying in terms of mechanical wave theory, but the only evidence I can provide is that delta Cep is described as having an amplitude of nearly 1 mag, and it ranges from about 3.6 to about 4.4.
That makes sense. I just wasn't sure of the explanation when I was going over our missed questions with my partner. Thank you!

BYHscioly
Member
Member
Posts: 43
Joined: January 12th, 2012, 5:01 pm
Division: C
State: NJ
Has thanked: 0
Been thanked: 0

Re: Astronomy C

Post by BYHscioly » May 10th, 2013, 5:20 pm

Do we need to know any hard astrophysics? Like aside from parallax, Stefan-Boltzmann's, distance modulus, redshift, Wien's, etc.?
1st Fermi (2013), 2nd Astro (2014), 3rd DP (2014), 4th DP (2012)

syo_astro
Exalted Member
Exalted Member
Posts: 601
Joined: December 3rd, 2011, 9:45 pm
Division: Grad
State: NY
Has thanked: 0
Been thanked: 5 times
Contact:

Re: Astronomy C

Post by syo_astro » May 10th, 2013, 5:53 pm

BYHscioly wrote:Do we need to know any hard astrophysics? Like aside from parallax, Stefan-Boltzmann's, distance modulus, redshift, Wien's, etc.?
By that are you asking whether for nats you need to know about astronomical math? I would say definitely know those. I think before on the forums some things have been mentioned. On the wiki there is an equation sheet (that's only meant to act as some examples, I recommend copying it, but definitely edit it and add to it to your liking). Cicc's test also has some very nice math on X-ray binaries, cepheids, and pulsars if I recall. Some nats tests are available online either on the test exchange or elsewhere. Any areas you're worried about specifically?
B: Crave the Wave, Environmental Chemistry, Robo-Cross, Meteorology, Physical Science Lab, Solar System, DyPlan (E and V), Shock Value
C: Microbe Mission, DyPlan (Earth's Fresh Waters), Fermi Questions, GeoMaps, Gravity Vehicle, Scrambler, Rocks, Astronomy
Grad: Writing Tests/Supervising (NY/MI)

BYHscioly
Member
Member
Posts: 43
Joined: January 12th, 2012, 5:01 pm
Division: C
State: NJ
Has thanked: 0
Been thanked: 0

Re: Astronomy C

Post by BYHscioly » May 12th, 2013, 11:59 am

I was just hoping there wouldn't be any of that college physics stuffs.

Are the scores for the PA tests released? If so, are they online? We took a practice test so...
1st Fermi (2013), 2nd Astro (2014), 3rd DP (2014), 4th DP (2012)

AlphaTauri
Staff Emeritus
Staff Emeritus
Posts: 829
Joined: September 11th, 2009, 1:41 pm
Division: Grad
State: PA
Location: 04h 35m 55.239s, +16° 30′ 33.49″
Has thanked: 0
Been thanked: 0
Contact:

Re: Astronomy C

Post by AlphaTauri » May 13th, 2013, 12:23 pm

If you want, you can PM the PA State writer, Mr. Cicc (JCicc on the forums), to ask for scores; I don't know if he wants them posted publicly.

I think, however, that I'm allowed to tell you that the high score this year was a 74, with the Top 5 stretching down to 60. Last year's high score was an 88, with the Top 5 down to 58.
Hershey Science Olympiad 2009 - 2014
Volunteer for Michigan SO 2015 - 2018

]\/[ Go Blue!

Locked

Return to “2013 Study Events”

Who is online

Users browsing this forum: No registered users and 2 guests