Question 1

The velocity toward you or away from you is called ______.&#10;A) radial&#10;B) space&#10;C) transverse&#10;D) tangential

Accepted Answer

The velocity of an object moving toward or away from an observer is referred to as radial velocity. This term is commonly used in astronomy and other fields to describe the motion along the line of sight between an observer and an object.

Question 2

An object moving toward you is said to be _______.&#10;A) blueshifted&#10;B) redshifted&#10;C) null shifted&#10;D) Doppler shifted

Accepted Answer

When an object moves toward an observer, its light waves are compressed, leading to a shift toward the blue end of the spectrum, known as blueshift.

Question 3

An object moving away from you is said to be _______.&#10;A) blueshifted&#10;B) redshifted&#10;C) null shifted&#10;D) Doppler shifted

Accepted Answer

When an object moves away from an observer, its light is stretched to longer wavelengths, causing a redshift.

Question 4

Doppler broadening is used to determine the _________ of a star.&#10;A) radial velocity&#10;B) rotation rate&#10;C) transverse velocity&#10;D) temperature

Accepted Answer

The answer of Doppler broadening is used to determine the...

Question 5

_______ detects motion toward or away from you.

Accepted Answer

The answer of _______ detects motion toward or away from...

Question 6

A __________ in light indicates motion towards the observer.

Accepted Answer

The answer of A __________ in light indicates motion towards...

Question 7

Radial velocity measures motion along the line of sight.

Accepted Answer

Radial velocity is the component of the velocity of an object, directed along the line of sight towards or away from the observer.

Question 8

An increasing Doppler shift is means the object is moving faster toward or away from you.

Accepted Answer

An increasing Doppler shift indicates that the frequency of the wave (sound, light, etc.) is changing due to the object moving faster toward or away from the observer, leading to a compression or stretching of the wave frequencies.

Deck 25: The Doppler Shift