ph 104 midterm - 2

# ph 104 midterm - 2 - Descriptive Astronomy (PH104) Winter...

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Descriptive Astronomy (PH104) Winter Term 2009 Some Review Questions for Midterm Exam #2 This is a list of review questions from which exam questions will be taken. The questions are divided into different categories. Some of this material will be covered in lecture and labs; some will come from your reading (textbook.) Most of this will be new to students who have not taken astronomy before. As you should be able to tell from some of the questions, just memorizing information is not enough to do well on the tests. You must be able to apply knowledge in meaningful ways. Measurement 1) To how far out can stellar parallax find distances? Answer for both Earth-bound observations and space telescopes. Why is it any different to go into space for such measurements? 2) What are the units for luminosity ? 3) What are the units for apparent magnitude? Absolute magnitude? 4) What is parallax ? Triangulation ? Radar ? What are the limitations of these techniques for finding astronomical distances? 5) In parallax or triangulation measurements, what is a baseline ? 6) What is transverse velocity ? Radial velocity ? Proper motion ? Which of these can the Doppler Shift detect? 7) What are the special symbols they use for the radius and mass of the Earth and Sun? 8) What is density ? How is it computed? The Nature of Science 1) If we can only see things as they are visible to us right now, how can we know about anything that happened millions or billions of years ago when no human was around to take data? For example, how can we know anything about the evolution of a 10 billion year old star? Some Physics, Light, Physics of Light 1) What is the effect of a non-zero net force acting on an object? 2) What the heck is inertia ? 3) What are Newton’s Three Laws? What do they mean? Be able to explain them in different ways. What are each of the three laws also known as? Can you state the second law mathematically? 4) Be able to recognize action-reaction force pairs. 5) What is a vector? What does it mean to say that velocity (or acceleration, or force , or. ..) is a vector? 6) In what way is an object traveling in a curved path accelerating (even if its speed is constant)? 7) How is it clear that some force is acting on any object in orbit? How is it clear that these

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objects (planets, moons, whatever) are accelerating ? What is that force acting on any object in orbit (causing the orbit)? 8) What does equilibrium mean? How is a state of equilibrium achieved? 9) Combining Newton’s Law of Gravitation with Kepler’s Third Law of Planetary motion is useful how? 10) What is electromagnetic radiation ? Thermal radiation? What are the common examples? Distinguish electromagnetic radiation from nuclear radiation. 11) What is the nature of light? (And ALL electromagnetic radiation)? What is the
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## This note was uploaded on 09/29/2009 for the course PH 104 taught by Professor Price during the Spring '08 term at Oregon State.

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ph 104 midterm - 2 - Descriptive Astronomy (PH104) Winter...

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