Uncover each hint by clicking on the line with HINT written on it. They'll be most useful if used in order so start from the top and work your way down. If you'd like to see an answer to/explanation of each hint, just put your mouse on top of the black area between hints. When you move your mouse away, they will become hidden rehidden in case you only want to glimpse at the hint.
Or click here to disable the autohide feature.
Good Luck!
HINT:Lets consider first what the question is asking.
The question asks us to determine the observable diameter of the Cas A remnant in arc-seconds
HINT:What information does the problem give us?
The previous problem provides us with the observed size of the remanant in pixels. We can convert these pixels to arc seconds.
HINT:What is the relationship between the information given and the
information needed?
Obervable Diameter = diameter(pixels) * 1 arc-seconds/2 pixels
HINT:What information do we need to plug into the relationship?
diameter(pixels) = 700 pixels
HINT: Are we going to need to convert the units of any of the information that
we have gathered?
Let's use unit analysis:
OD = diameter(pixels) * (1 arc-second/2 pixels)
All units cancel except for arc-seconds, so we do not need to convert any units!
HINT:Plug all of the information in to the final calculation!
OD = 700 pixels * (1 arc-second/2 pixels) = 350 arc-seconds

close window