21st Century Astronomy 6E
6th Edition
ISBN: 9780393690675
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 6, Problem 24QP
To determine
Describe quantum efficiency and integration time and how it is related in observing the faint astronomical objects.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Explain spectroscopy as a study within astronomy. Include the following information: how the process is conducted, what information it can provide, and why it is essential to the study of astronomy.
Describe the SPECT and PET imaging techniques.
level
an ther
will such radars disturb such radio astronomy measurements
4. If the intensity of the Sun peaks in the optical range, at a frequency of about 3:4 x 10 Hz, what is the
temperature of the Sun? Use the Wien displacement law (1.25). If all of the power is emitted only between
3 and 4 x 10 Hz, how many photons per cm² arrive at the earth when the Sun is directly overhead? What
is the power received on earth per cm³? A value for the solar power is 135mW per cm². How does this
compare to your calculation?
Chapter 6 Solutions
21st Century Astronomy 6E
Ch. 6.1 - Prob. 6.1ACYUCh. 6.1 - Prob. 6.1BCYUCh. 6.2 - Prob. 6.2CYUCh. 6.3 - Prob. 6.3CYUCh. 6.4 - Prob. 6.4CYUCh. 6.5 - Prob. 6.5CYUCh. 6 - Prob. 1QPCh. 6 - Prob. 2QPCh. 6 - Prob. 3QPCh. 6 - Prob. 4QP
Ch. 6 - Prob. 5QPCh. 6 - Prob. 6QPCh. 6 - Prob. 7QPCh. 6 - Prob. 8QPCh. 6 - Prob. 9QPCh. 6 - Prob. 10QPCh. 6 - Prob. 11QPCh. 6 - Prob. 12QPCh. 6 - Prob. 13QPCh. 6 - Prob. 14QPCh. 6 - Prob. 15QPCh. 6 - Prob. 16QPCh. 6 - Prob. 17QPCh. 6 - Prob. 18QPCh. 6 - Prob. 19QPCh. 6 - Prob. 20QPCh. 6 - Prob. 21QPCh. 6 - Prob. 22QPCh. 6 - Prob. 23QPCh. 6 - Prob. 24QPCh. 6 - Prob. 25QPCh. 6 - Prob. 26QPCh. 6 - Prob. 27QPCh. 6 - Prob. 28QPCh. 6 - Prob. 29QPCh. 6 - Prob. 30QPCh. 6 - Prob. 31QPCh. 6 - Prob. 32QPCh. 6 - Prob. 33QPCh. 6 - Prob. 34QPCh. 6 - Prob. 35QPCh. 6 - Prob. 36QPCh. 6 - Prob. 37QPCh. 6 - Prob. 38QPCh. 6 - Prob. 39QPCh. 6 - Prob. 40QPCh. 6 - Prob. 41QPCh. 6 - Prob. 42QPCh. 6 - Prob. 43QPCh. 6 - Prob. 44QPCh. 6 - Prob. 45QP
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Describe the techniques radio astronomers use to obtain a resolution comparable to what astronomers working with visible light can achieve.arrow_forwardWhat would be the properties of an ideal astronomical detector? How closely do the actual properties of a CCD approach this ideal?arrow_forward1. How do I calculate LOD (limit of detection) when I have a negative slope? 2. Can LOD be negative?arrow_forward
- The James Webb Telescope is an important innovation in Astronomy and its implementation was first explained to the public during the timeline of our course this summer. Prepare an explanation which includes the following: What is the James Webb Telescope? Include a description of the tool itself and a brief history. What is the importance/significance of this tool for future astronomical studies?arrow_forwardDistant spectroscopy. Give at least 7 applications and explain each one.arrow_forwardRemote Spectroscopy. Spectrometers mounted on aircraft and satellites have been used to obtain spectralinformation about the earth. How do these systems work? Cite specific uses of these remote spectroscopytechniques.arrow_forward
- a) The star 58 Eridani is a feint but naked-eye star similar to the Sun. Suppose that you are observing this star in the night sky without a telescope. Ignoring any interstellar extinction or atmospheric absorption, approximately how many photons per second arrive at your retina? Show all steps in your calculation. Look up any required information about the star using Wikipedia. Use sensible approximations so your calculation is straightforward. For example you could consider only the region of the spectrum where the photon flux peaks. b) The Mid-Infrared Instrument (MIRI, camera and spectrograph) on the James Webb Space Telescope operates in the band 5 – 28 µm. For 58 Eridani, approximately how many photons per second can be used by this instrument? Assume that MIRI takes all the photons from the full JWST mirror. Show all steps in your calculation. Describe briefly two or three other factors which play a role in determining the sensitivity of an instrument such as MIRI?arrow_forwardSuppose you are looking for sites for a visible-light observatory, an infrared observatory, and a radio observatory. What are the main criteria of excellence for each? What sites are actually considered the best today?arrow_forwardHow many more times can keck telescope 10 m in diameter gather rather than a an amateur telescope gather .25 in diameter? Hint Consider formula of area in a circlearrow_forward
- Hubble’s Field of View. Large telescopes often have small fields of view. For example, the Hubble Space Telescope’s (HST’s) advanced camera has a field of view that is roughly square and about 0.06° on a side. a. Calculate the angular area of the HST’s field of view in square degrees. b. The angular area of the entire sky is about 41,250 square degrees. How many pictures would the HST have to take with its camera to obtain a complete picture of the entire sky?arrow_forwardUse the new values in this problem and just replace them with the ones in the image. solve it exactly the same way. I need the calculations to be 100 percent. 1) nd = 5.52 x 1012 m-3, 2) ni = 5.2 × 1015 m-3 (the value for Si at T = 300 K). Compute your answer in electrons m-3 but do not include units in your answer. accurate to 2 decimal places (X.XXEY or X.XXE-Y).arrow_forwardA)The star 58 Eridani is a feint but naked-eye star similar to the Sun. Suppose that you are observing this star in the night sky without a telescope. Ignoring any interstellar extinction or atmospheric absorption, approximately how many photons per second arrive at your retina? Show all steps in calculation . B) The Mid-infared Instrument (MIRI , camera and spectrograph ) on the James Webb Space Telescope operates in the band 5-28 µm . For 58 Eridani , approximatley how many photons per second can be used by this instrument ? Assume that MIRI takes all the photons from the full JWST mirror . Show all steps in calcultation . Describe breifly two or three other factors which play a role in determining the sensetivitu of an instrument such as MIRI ?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
