Download b. - UW Canvas

Post-18.1: This graph shows the functional form of the
dependence of the parallax angle on the distance an
object is from Earth. If the minimum parallax angle we
could measure were 0.5 arcsec, what is the maximum
distance of a star that we could measure?
a. ~ 1.00 arcsec
b. ~ 2.2 pc
c. ~ 10 pc
©2014 W. W. Norton & Company, Inc.
8
Post-18.1: This graph shows the functional form of the
dependence of the parallax angle on the distance an
object is from Earth. If the minimum parallax angle we
could measure were 0.5 arcsec, what is the maximum
distance of a star that we could measure?
a. ~ 1.00 arcsec
b. ~ 2.2 pc
c. ~ 10 pc
©2014 W. W. Norton & Company, Inc.
9
Post-18.2: The Moon never stops in its orbit; however, it
is possible to get an exact measurement of its parallax
and thus its distance at any given moment. How would
we get the parallax shift of the Moon?
a. Take simultaneous measurements from two
locations.
b. Take two measurements at different times from
one location.
c. Take two measurements from the same location
at the same phase of the Moon.
©2014 W. W. Norton & Company, Inc.
10
Post-18.2: The Moon never stops in its orbit; however, it
is possible to get an exact measurement of its parallax
and thus its distance at any given moment. How would
we get the parallax shift of the Moon?
a. Take simultaneous measurements from two
locations.
b. Take two measurements at different times from
one location.
c. Take two measurements from the same location
at the same phase of the Moon.
©2014 W. W. Norton & Company, Inc.
11
Post-18.3: An equation in the form of y = 1/x governs the
relationship between the parallax angle and the distance. In
gravity, which equation states the proportionality between the
force and the distance? a.
1
y= 2
x
b.
y =1 / x
c.
y=x
©2014 W. W. Norton & Company, Inc.
12
Post-18.3: An equation in the form of y = 1/x governs the
relationship between the parallax angle and the distance. In
gravity, which equation states the proportionality between the
force and the distance? a.
1
y= 2
x
b.
y =1 / x
c.
y=x
©2014 W. W. Norton & Company, Inc.
13
Post-18.4: The table below lists the three stars of
Orion’s belt. Which of the following ranks these stars
from nearest to farthest?
a.
b.
c.
Mintaka, Alnilam, Alnitak
Alnilam, Alnitak, Mintaka
Mintaka, Alnitak, Alnilam
©2014 W. W. Norton & Company, Inc.
14
Post-18.4: The table below lists the three stars of
Orion’s belt. Which of the following ranks these stars
from nearest to farthest?
a.
b.
Mintaka, Alnilam, Alnitak
Alnilam, Alnitak, Mintaka
c. Mintaka, Alnitak, Alnilam
©2014 W. W. Norton & Company, Inc.
15
Post-18.5: True or False: Alnilam is approximately three
times farther away from us than Mintaka.
a. true
b. false
©2014 W. W. Norton & Company, Inc.
16
Post-18.5: True or False: Alnilam is approximately three
times farther away from us than Mintaka.
a. true
b. false
©2014 W. W. Norton & Company, Inc.
17
Post-18.6: The parallax for the star Sirius, constellation
Canis Major, is 0.379 arc seconds; the parallax for the
star Rigel, constellation Orion, is 0.00378 arc seconds. Approximately how much farther away from us is Rigel
than Sirius?
a. 10 times farther
b. 100 times farther
c. 1000 times farther
©2014 W. W. Norton & Company, Inc.
18
Post-18.6: The parallax for the star Sirius, constellation
Canis Major, is 0.379 arc seconds; the parallax for the
star Rigel, constellation Orion, is 0.00378 arc seconds. Approximately how much farther away from us is Rigel
than Sirius?
a. 10 times farther
b. 100 times farther
c. 1000 times farther
©2014 W. W. Norton & Company, Inc.
19
This concludes Activity 18: Finding Distances to
Stars Using Parallax Measurements
©2014 W. W. Norton & Company, Inc.
20