Question

Below are represented 3 sets of photographs, of different star fields, taken from the earth at 6 month intervals. Complete parts a-e of this question.

a. In each set one star shows a parallax shift. Circle the star on each photograph of each set which shows this shift.

b. Measure the shift in mm and place the values below.

set A _______mm

set B _______mm

set C _______mm

c. Which set of photographs indicate the most distant star? Explain.

d. Which set of photographs indicate the closest star? Explain.

e. Describe how distance and parallax are related.

5. Below are represented 3 sets of photographs, of different star fields, taken from the earth at 6 month intervals. Complete parts ae of this question. Ser A Ser B

Answer 1

b.set A 28.8 mm

set B 9.8 mm

set C 18.17 mm

Parallax is the change in the apparent position of an object with change in the position of the observer. We can determine the distance of a faraway star from the parallax distance of that star on the night sky. When the distance between the object and the observer increases, the apparent movement of the object becomes less in distance. It can be better understood with an example of a tree and an observer. Suppose you are on a train and the train is moving fast. When some tree remain close to the train, the tree can be seen for a short term of time. When the tree is situated at greater distance from the train, the tree remains in sight for a long term. This is because the apparent motion of a far away object is less than the object remaining close to us.

So, taking this example and extrapolating it for the objects at great distances away from us, it is very easy to understand that Parallax is dependent on the distance of that object and is inversely proportional to the distance.

This relation is given by:

D=1/P

D=distance

P=parallax(This is the answer to the question no e.)

c.As the parallax(apparent distance between the two positions of the star)is lowest for the Set B.So, this star is situated farthest away from us.

d.As the parallax is highest for the Set A .So, this star is situated nearest to us.

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