Visions of the Universe Lab
Visions of the Universe Lab ISP 205L
Popular in Course
Popular in Integrative Studies Physical
This 1 page Class Notes was uploaded by Ms. Mckenzie Labadie on Saturday September 19, 2015. The Class Notes belongs to ISP 205L at Michigan State University taught by Jack Baldwin in Fall. Since its upload, it has received 17 views. For similar materials see /class/207721/isp-205l-michigan-state-university in Integrative Studies Physical at Michigan State University.
Reviews for Visions of the Universe Lab
Report this Material
What is Karma?
Karma is the currency of StudySoup.
Date Created: 09/19/15
ISP 205 Lab 2 Exam 1 Suppose you are trying to measure the apparent brightness of a star Explain why the uncertainty of your brightness measurement decreases if you use a longer exposure time 0 The uncertainty of your brightness measurement decreases when you use a longer exposure time because more data is collected during longer exposure More light photons are captures therefore the signal to noise ratio increases The additional photons during additional exposure will clarify more signal from the noise For every additional signal the noise is the squared Therefore the noise increases slower and a longer period would increase the signal ratio 2 Explain why an uncertainty in luminosity leads to an uncertainty in distance when you are using the standard candle technique to measure the distance to a galaxy 0 When measuring the distance to a galaxy the luminosity and distance are linked directly because the square inverse law is used The standard candle method uses a known luminosity to measure the distance An apparent luminosity must be measured as well to use to determine the distance If the luminosity is off the distance will also shift 3 Explain why we use the standard candle technique and not parallax to measure the distances to galaxies 0 The standard candle technique is used to measure distance to galaxies that are farther away than parallax can distinguish The farther an object the smaller the parallax is and after a certain distance the angle for parallax gets too small The standard candle technique uses set known stars with luminosities that already have known far distances and can accurately give the distance 4 Explain why it s easier to find highmass planets than lowmass planets using the radial velocity technique How do planet mass and distance from a star affect a star s radial velocity 0 It is easier to find a high mass planet using the radial velocity technique because a higher mass planet exerts a stronger force of gravity which gives it amore detectable radial velocity The radial velocity technique uses the tug a planet exerts on its star and the tug can be seen through the Doppler shift The closer the orbit and the higher the mass the more effect is observed 5 Define the terms correlation and morphology Describe one correlation seen in galaxies between morphology and some other characteristic and give a short physical explanation for the correlation observed 0 Correlation Finding a relationship between two variables 0 Morphology What it looks like and how things are moving Shape and Kinematics 0 One correlation with morphology can be that the color of a galaxy can indicate what kind of galaxy it is For example an elliptical galaxy is seen as redyellowish because older stars can t give off blue light So it is possible that the elliptical galaxies are older 6 How do we determine cluster ages based on the star s location on the HR diagram What constraints are placed on the age by observing a single main sequence star in the cluster