IOAA 2013, Отборен тур, вертикални въпроси — Задача 7. G.

13 т.

Условие

i. The four greatest celestial objects in descending order of size:

  1. Moon
  2. Europa
  3. Ganymede
  4. Io
  5. Mercury
  6. Titan
  7. Callisto
  8. Triton
  9. Titania [4 т.]
Hertzsprung–Russell diagram (luminosity in solar units 10^-5 to 10^6 versus surface temperature in Kelvin, spectral classes O–M) showing the evolutionary track of a Sun-like star with points numbered 1–9: main sequence 1, 2, subgiant 3, red giant 4, helium-burning star 5, double shell-burning red giant 6, planetary nebula 7, a dashed path 8 and 9 down to the white dwarf sequence.

ii. At which point does the Helium Flash occur? [1 т.]

iii. The polarity of the solar magnetic field is reversed every __years. (integer) [2 т.]

iv. RR Lyrae, Mira, Classical Cepheid, Eclipsing Binary [4 т.]

Four light curves numbered 1–4 (apparent magnitude versus days): 1 regular saw-tooth pulsations of about half a day period, magnitude 7.0–8.0; 2 flat curve at 15.6 with narrow deep and shallow alternating dips, days 0–25; 3 saw-tooth variation of several days period, magnitude about 6.0–7.0; 4 large-amplitude slow variation over 0–2500 days.

v. Days between the longest day in southern hemisphere and the next equinox. [2 т.]

Отговори

Решение

Внимание: Непълно решение

The paper prints only the answer code after each question (the crossword grid entry); no worked solution is given.

Оригинал в Архива: Vertical_questions.pdf