IOAA 2013, Отборен тур, вертикални въпроси — Задача 10. J.

13 т.

Условие

i. The CMBR has a thermal black body spectrum at a temperature of __Kelvin. (two decimals) [3 т.]

ii. This nebula is M__. [2 т.]

Colour photograph of a bluish reflection nebula with dark dust, connected by red lines to a red dot on a star chart of Orion and neighbouring constellations (Gemini, Taurus, Monoceros, Canis Major, Lepus, Eridanus; Betelgeuse, Rigel, Aldebaran, Sirius, NGC 2238 labelled).

iii. Radiation with an energy of 2.5eV.

  1. gamma-ray
  2. X-ray
  3. Ultraviolet
  4. Visible
  5. Infrared
  6. Far Infrared
  7. Microwave
  8. Radio
  9. Super Low Frequency [1 т.]

iv. Two exoplanets with a radius five times the radius of Earth rotate around a star (radius equal to this of the Sun). Find the shortest orbital period (days). (two decimals) [3 т.]

Light curve: relative intensity (0.985 to 1.000) versus days (65 to about 95), a noisy wavy curve with dips and peaks.

v. The first to calculate the AU by measuring the parallax of a planet:

  1. Cassini
  2. Aristachus
  3. Hipparchus
  4. Horrocks
  5. Halley
  6. Bayly
  7. Euler
  8. Lomonosov
  9. Newcomb [1 т.]

vi. The diameters of the stars (Sirius, Betlegeuse, Aldebaran, Antares, Rigel, Pollux, Arcturus, Sun) are to scale.

Betlegeuse, Antares, Rigel [3 т.]

Illustration of eight stars drawn to scale on a grey background, numbered 1–8: 1 a tiny point marked by an arrow, 2–4 small spheres, 5 a larger pale blue sphere, 6 a red-orange sphere, 7 a large orange sphere and 8 the largest orange sphere.

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