Orbital velocity of the earth using stellar spectra
In this exercise you will find the orbital velocity of the Earth by measuring the Doppler shift in
the spectrum of the star Arcturus. Among the very brightest of stars, shining with a soft orange
light, Arcturus lights northern spring skies. While orbiting the Sun, the Earth moves towards the
Arcturus half of its orbital period and it moves away from the star rest of the period as shown in
figure. When the Earth is moving towards and away from the star, the observed light is
respectively blue-shifted and red-shifted
Earth moving away
Earth moving towards
The photocopied figure (taken from SKY AND TELESCOPE) below displays two spectrograms
of the star Arcturus taken six months apart. The top and the bottom spectrograms are of a
reference light source at rest with respect to the telescope. Corresponding to each of the reference
lines is a dark line in the star spectrum, displaced slightly to the right (red-shifted) in , and to
the left (blue-shifted) in
Select line 1 and measure the displacement of it in and to tength of millimeters. One way to
do it is to use a straight edge to connect matching reference lines as shown in the figure on the
lower right corner on the next page. The shift are shown by filled rectagles (red in a and blue in
b) in the figure.Measure the shifts with a scale estimating to tength a tength of millimeter. A
magnifying glass would be handy. Try to be as accurate as possible. The measurements give the
shift Al in mm for the line. Draw a table similar to one shown below and note down the
measurements. Repeat the process for lines 1, 3, 5, and 7 and enter into the table.
line original shift A?» shift AX _ A_/1
110 WaVe1ength spectrum spectrum spectrum spectrum 10
ORDER THIS ESSAY HERE NOW AND GET A DISCOUNT !!!
Our Service Charter
Excellent Quality / 100% Plagiarism-FreeWe employ a number of measures to ensure top quality essays. The papers go through a system of quality control prior to delivery. We run plagiarism checks on each paper to ensure that they will be 100% plagiarism-free. So, only clean copies hit customers’ emails. We also never resell the papers completed by our writers. So, once it is checked using a plagiarism checker, the paper will be unique. Speaking of the academic writing standards, we will stick to the assignment brief given by the customer and assign the perfect writer. By saying “the perfect writer” we mean the one having an academic degree in the customer’s study field and positive feedback from other customers.
Free RevisionsWe keep the quality bar of all papers high. But in case you need some extra brilliance to the paper, here’s what to do. First of all, you can choose a top writer. It means that we will assign an expert with a degree in your subject. And secondly, you can rely on our editing services. Our editors will revise your papers, checking whether or not they comply with high standards of academic writing. In addition, editing entails adjusting content if it’s off the topic, adding more sources, refining the language style, and making sure the referencing style is followed.
Confidentiality / 100% No DisclosureWe make sure that clients’ personal data remains confidential and is not exploited for any purposes beyond those related to our services. We only ask you to provide us with the information that is required to produce the paper according to your writing needs. Please note that the payment info is protected as well. Feel free to refer to the support team for more information about our payment methods. The fact that you used our service is kept secret due to the advanced security standards. So, you can be sure that no one will find out that you got a paper from our writing service.
Money Back GuaranteeIf the writer doesn’t address all the questions on your assignment brief or the delivered paper appears to be off the topic, you can ask for a refund. Or, if it is applicable, you can opt in for free revision within 14-30 days, depending on your paper’s length. The revision or refund request should be sent within 14 days after delivery. The customer gets 100% money-back in case they haven't downloaded the paper. All approved refunds will be returned to the customer’s credit card or Bonus Balance in a form of store credit. Take a note that we will send an extra compensation if the customers goes with a store credit.
24/7 Customer SupportWe have a support team working 24/7 ready to give your issue concerning the order their immediate attention. If you have any questions about the ordering process, communication with the writer, payment options, feel free to join live chat. Be sure to get a fast response. They can also give you the exact price quote, taking into account the timing, desired academic level of the paper, and the number of pages.