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(PHYS002)mid1a_f02.pdf
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Physics 002 Midterm 1 10 October 2002.
Time allowed: 70 minutes Total: 70 marks
Name:
Student ID:
A
Part A: True or false questions (18 marks, 2 marks each)
True
False
1
You are located 23.5 degrees South latitude. On 21 September, nights begin to get longer than days.
2
If the local time is 3 pm, and the Moon is directly overhead, the most likely phase of the Moon is gibbous.
3
During a total lunar eclipse, the Moon is in Earths umbra.
4
As viewed from Earth, Venus can go through a full set of phases.
5
If you live on Mars, Mercury is never seen in the sky at midnight.
6
On a mountain top, a telescope with a diameter of 5 cm is able to distinguish 2 stars separated by an angle of 1 arc seconds.
7
Light from stars has an emission spectrum.
8
Refracting telescopes suffer from the problems of chromatic aberration and the sagging of mirrors.
9
Ultraviolet radiation from stars can be detected by Earthbound telescopes.
Part B Short questions (16 marks, 2 marks each)
What are the temperatures of the following stars? Give your answer to the nearest thousand degrees Kelvin. (Surface temperature of the Sun = 6,000 K)
Answer
1
A star with a maximum intensity at a wavelength of 800 nm.
2
A star with strong lines of hydrogen.
3
A star whose flux is 25 times that from the Sun.
The above figure shows the positions of Earth, Sun and twelve constellations on the ecliptic, as viewed from above the North Pole on 1 November. (The constellations are effectively at infinite distance from the solar system.)
Answer
4
Which constellation is directly overhead at midnight on 1 November?
5
What is the angle of elevation of Gemini at midnight on 1 November? (The angle of elevation of an object is the angle its direction makes with the horizon.)
6
Which constellation is rising from the East at midnight on 1 November?
7
Which constellation is directly overhead at 10 pm on 1 November?
8
On the first day of which month can Leo be seen directly overhead at midnight?
Aquarius
Name:
Student ID:
A
Part C Problems (Show all steps.)
Problem 1 (16 marks)
You are staying in Shanghai where the latitude is 31oN.
(a)
The Orion lies on the celestial Equator. At what angle do you have to raise your head towards the South to see it at the highest position of the whole year?
(b)
At what angle do you have to raise your head to see the noon Sun at the Summer Solstice?
(c)
Answer (c) if the time is the Winter Solstice.
(d)
Knowing that the orbit of the Moon m