Estimating speeds and distance of far-off objects

Explain the use of cosmic distance ladder.

• A. It is a method used in determining the distance of far-off objects which involves several

  processes that are not related to one another.

• B. It is a method used in determining the distance of far-off objects which involves several

  processes that build on one another.

• C. It is a method used in determining the distance of far-off objects which involves one

  process only.

• D. It is a method used in determining the distance of far-off objects which involves several

  processes that can only measure limited distances.

2. Which of the following correctly describes the use of parallax to estimate the distance of objects?

I.       It is a sequence of methods astronomers use to determine the distances to objects in the universe.

II.      It is used in measuring distance of stars that are approximately 300 light years away

III.     Parallax is a technique used to measure the distance of objects in astronomy

IV.    It is the shift in the wavelength of the emitted light of an object which is proportional to the speed with which the object moves

• A.    I and II

• B.    III and IV

• C.    II and III

• D.    All of the above

Which of the following best explains the use of Doppler effects?

• A. By measuring the distance between celestial objects.

• B. By determining the chemical composition of stars and galaxies.

• C. By giving the measurement of the speed of a celestial object coming toward us (blueshift) or moving away from us (redshift).

• D.  By predicting the future evolution of planetary systems.

How will you describe the use of radar in astronomy to estimate the distance of celestial objects?

• A.  a modern method of measuring distances is based on the fact that light travels with a speed of 300,000 km/sec

• B. a method that analyzing the colors emitted by celestial objects.

• C. A method that detects the gravitational forces exerted by nearby objects

• D.  a method to observing the redshift or blueshift of spectral lines.

Explain the use of cepheids to utilized as cosmic yardsticks in measuring distances in astronomy.

• A.  By measuring the brightness of Cepheids to determine their chemical composition.

• B.  By observing the redshift or blueshift of Cepheids' spectral lines.

• C.  By analyzing the periodic brightening and dimming behavior of Cepheids.

• D.  By timing the round-trip travel of radio waves to and from Cepheids.