(Redirected from Superluminal astronomy/Quiz)

Superluminal astronomy is a lecture from the department of radiation astronomy. It is included in the advanced undergraduate course on the principles of radiation astronomy.

Superluminal motion in quasar 3C279 is shown in a "movie" mosaic of five radio images made over seven years. Credit: NRAO/AUI.

You are free to take this quiz based on superluminal astronomy at any time.

To improve your score, read and study the lecture, the links contained within, listed under See also, External links, and in the `{{principles of radiation astronomy}}` template. This should give you adequate background to get 100 %.

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, Faster-than-light (superluminal or FTL) communications and travel refer to the propagation of information or matter faster than the speed of light.

 Yes No

2 The first astronomical superluminal source in the constellation Indus is likely to be which of the following?

 the Sun the Small Magellanic Cloud Scorpius X-1 the Large Magellanic Cloud a Seyfert 1 galaxy

3 Under the

 theory of relativity, a particle (that has mass) with subluminal velocity needs energy to accelerate to the speed of light.

4 Phenomena associated with apparent superluminal motion are

 tachyons an optical illusion the object partly moving in the direction of the observer large amounts of mass moving at close to half the speed of light speed calculations assume it does not move in the direction of the observer velocities close to the speed of light relative to our reference frame

5 Complete the text:

 Having a speed greater than is called a .

6 Complete the text:

 Match up the type of speed effect with each of the possibilities below: superluminal - A luminal - B subluminal - C transluminal - D tachyons - E tardyons - F speeds which cross the speed of light . speed equal to that of light . particles moving at speeds slower than light . speed less than light . particles moving at speeds faster than light speed greater than light .

7 Complete the text:

 Match up the observation with the phenomena: B1828+487 - A PKS0521-36 - B Fanaroff-Riley (FR) type II radio source - C prototypical type 2 Seyfert - D Frank–Tamm formula - E a type 1 Seyfert - F . . . . .

8 Which of the following is not an astronomical superluminal source?

 3C 345 3C 48 3C 263 3C 179 3C 245 3C 279

9 True or False, The very fast neon nova GK Persei rivalled the brightness of Vega at the peak of its outburst in 1901.

 TRUE FALSE

10 Which of the following is associated with the first superluminal motion phenomenon in our galaxy?

 the Spring of 1994 4,000 light-years away VLT observations GRS 1915 MERLIN Jodrell Bank

11 True or False, X-ray outbursts are associated with pulsars not quasars.

 TRUE FALSE

12 Anomalous dispersion is associated with which of the following?

 refractive index decrease in index Scorpius X-1 group velocity can be boosted to beyond the velocity of its constituent waves resonance of ionized hydrogen

13 In the dispersed image, a single cloud of gas with small

 motions have a single shift.

14 Chemistry phenomena associated with superluminal sources are

 galactic recession O III Hubble parameter current density synchrotron radiation C IV

15 Complete the text:

 The spectra of active galactic are noteworthy in showing species with a large range in at once.

16 Complete the text:

 Match up the type of radiation with each of the superluminal possibilities below: meteors - A electrons - B neutrinos - C gamma rays - D X-rays - E opticals - F superluminal signal transfer . sychrotron emission through the optical into the X-ray regime . conelike illumination pattern . electroweak Cherenkov radiation . index of refraction is often greater than 1 knots .

17 Complete the text:

 Match up the superluminal detector with the image: Hopkins Ultraviolet Telescope - A International Ultraviolet Explorer - B C. Donald Shane telescope - C 2.3m Bok Telescope - D VLA - E LHCb - F AMS-02 - G . . . . . .

18 Which of the following are not known as an astronomical superluminal source?

19 True or False, The paths of small-scale jets are not always radial to the nucleus.

 TRUE FALSE

20 Which of the following are associated with the envelope of the polarization current density?

 emission of electromagnetic radiation from a superluminal charged particle intensity of some components decays as the inverse of the distance from the source non-spherically-decaying sources emission contains very high frequencies not present in the synthesis of the source non-spherically decaying components of the radiation do not violate energy conservation strong electromagnetic fields are compensated by weak fields elsewhere

## Hypotheses

1. Questions can be used to take students through the faster-than-light analysis.