Paper 3 May 2012 TZ2 Physics

Topics: Light, Electromagnetic radiation, Sound intensity Pages: 44 (4099 words) Published: March 12, 2015
M12/4/PHYSI/HP3/ENG/TZ2/XX

22126515

Physics
Higher level
Paper 3

Candidate session number
0

0
Examination code

Friday 11 May 2012 (morning)
2

1 hour 15 minutes

2

1

2



6

5

1

5

INSTRUCTIONS TO CANDIDATES








Write your session number in the boxes above.
Do not open this examination paper until instructed to do so. Answer all of the questions from two of the Options.
Write your answers in the boxes provided.
A calculator is required for this paper.
A clean copy of the Physics Data Booklet is required for this paper. The maximum mark for this examination paper is [60 marks].

44 pages
© International Baccalaureate Organization 2012

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Option E — Astrophysics
E1. This question is about some of the properties of the star Aldebaran and also about galactic distances.

(a)

Aldebaran is a red giant star in the constellation of Taurus.

(i)

Describe the differences between a constellation and a stellar cluster.

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(ii) Define the luminosity of a star.

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(iii) The apparent brightness of Aldebaran is 3.3 × 10–8 W m–2 and the luminosity of the Sun is 3.9 × 1026 W. The luminosity of Aldebaran is 370 times that of the Sun. Show that Aldebaran is at a distance of 19 pc from Earth. (1 pc = 3.1 × 1016 m)

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(This question continues on the following page)

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(Question E1 continued)

(b) The apparent magnitude of Aldebaran is 0.75.

[1]

(i)

State what is meant by the apparent magnitude of a star.

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[2]

(ii) Use the answer to (a)(iii) to determine the...
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