# Energy phantoms/Quiz

Energy phantoms/Lecture is a lecture from the radiation astronomy department on the fundamentals of observational information.

This is a quiz based on the lecture that you are free to take at any time.

As a "learning by doing" resource, this quiz helps you to assess your knowledge and understanding of the information, and it is a quiz you may take over and over as a learning resource to improve your knowledge, understanding, test-taking skills, and your score.

Suggestion: Have the lecture available in a separate window.

To master the information and use only your memory while taking the quiz, try rewriting the information from more familiar points of view, or be creative with association.

Enjoy learning by doing!

## Quiz

1 Yes or No, An energy phantom is an observational phenomenon that can be described in general terms of distances and times.

 Yes No

2 True or False, A basic unit of length for measuring the diameter of the Sun is the kilometer.

 TRUE FALSE

3 Yes or No, A quantity that denotes the ability to do work and is measured in a unit dimensioned in mass × distance²/time² (ML²/T²) or the equivalent is called energy.

 Yes No

4 True or False, By assuming gravity causes the Earth and Sun to orbit each other, and assuming a mass for the Earth, a mass for the Sun can be determined from the orbital characteristics.

 TRUE FALSE

5 Yes or No, A physical quantity that denotes ability to push, pull, twist or accelerate a body which is measured in a unit dimensioned in mass × distance/time² (ML/T²): SI: newton (N); CGS: dyne (dyn) is called force.

 Yes No

6 True or False, By correlating the length of an Earth year to a fixed number of seconds, the length of time of a second can be determined.

 TRUE FALSE

7 Yes or No, In astronomy we estimate distances and times when and where possible to obtain forces and energy.

 Yes No

8 True or False, The source for apparent superluminal radiation may be superluminal acceleration.

 TRUE FALSE

9 Yes or No, Observationally, we may not know the origin of the force.

 Yes No

10 True or False, As the principal portion of the sunspot cycle corresponds well with a periodic conjunction of Venus and Jupiter, the increased electron flux to the Sun may cause the magnetic poles to reverse.

 TRUE FALSE

## Hypotheses

1. Timing can be applied to changes in distance.