HW4

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University of Michigan *

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102

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Electrical Engineering

Date

Apr 3, 2024

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pdf

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9

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ASTRO 102: Stars, Galaxies, and the Universe Winter 2024 Homework 4. Due: Thursday, 02/15 Name: Uniqename: Section Number or GSI name: • We request that you do your homework on paper or a tablet (the sheet you are reading can be printed and you can use it). We recommend that you write out any math by hand (neatly). If you need more space just add a sheet of paper and make it clear what is going on. Alternatively, using a tablet also works quite well. • Scan the pages into a pdf document using your phone (or other method of your choice). Upload to Gradescope, via the Canvas site. Videos on how how to scan into a pdf and upload to Gradescope are available on the Canvas site. • Make sure to mark the pages your answer to specific questions appear on in Gradescope. If you are unsure how to do this, please look at the gradescope video/website or ask your GSI. If you do not tag the pages that questions are answered on, this significantly increases the time it takes to grade the HWs and we will begin deducing points after HW 1. • We suggest you keep your original paper homework or the pdf you submitted to Gradescope for your own records. In the event that there is a computer error associated with Gradescope software your own records or paper copy will help to clarify the problem and secure your credit. • Homework will be graded based on correctness and clarity. Make sure that your work is easy to read and show all the work necessary to complete each quantitative problem, including units and conversions between units at each step. Simply stating the answer is not sufficient for credit, even if the answer is correct. When appropriate, use scientific notation and round your numerical result to a reasonable number of significant figures. • Do not use generative AI (such as ChatGPT or UM GPT) to produce your solutions. 4-1
4-2 Homework 4. Due: Thursday, 02/15 Problem 1 Take one page of notes on Chapter 5 of the textbook/lecture. (hint: the Big Picture and Summary of Key Concepts sections at the end of the chapter may be useful.) 10 points
Homework 4. Due: Thursday, 02/15 4-3 Problem 2 Select and answer five Quick Quiz Questions from Chapter 1. Write out the question and your answer selection. Justify your answer in no more than 2 sentences. Make sure to give the num- ber of the question you are answering. 10 points
4-4 Homework 4. Due: Thursday, 02/15 Problem 3 Quantitative on Chapter 5 (30 points total) Problem 3.1 Make sure that you understand Mathematical Insight 5.1. In astronomy, we often measure energy in electron Volts (eV). One eV is 1 . 6 × 10 19 Joules. 5 points : One of the wavelengths a hydrogen atom can a photon at is 656 nm. How much energy does each such a photon carry in eV and Joules? 5 points : One of the wavelengths that WiFi operates at is 5 gigaHerz (GHz). Express the energy of such a photon in eV and Joules 5 points : Suppose an electron in a hydrogen atom goes from level 2 (10.2 eV) above the ground state to level 3 (12.1 eV above the ground state). Did this hydrogen atom emit, absorb, or scatter a photon? What is the energy of the photon in eV
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