Detector Knowledge

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Questions and Answers

Which of the following is the primary function of our eyes?

  • To detect light (correct)
  • To measure light after it has been brought into focus
  • To record celestial objects
  • To take photographs

What is a detector?

  • A way to measure the sensitivity of our eyes
  • A tool for recording celestial objects
  • Something that measures light after it has been brought into focus (correct)
  • A device used for taking photographs

How can a telescope be used like a camera?

  • By attaching a camera lens to the telescope
  • By using CCDs to capture images
  • By using a telescope to take long exposure photographs
  • By removing the eyepiece and using a photographic plate or film in the focal plane (correct)

Why do astronomers sometimes use long exposure times when taking photographs with telescopes?

<p>To capture faint celestial objects that are not visible to the naked eye (D)</p> Signup and view all the answers

What are CCDs used for in astronomy?

<p>To capture images with higher sensitivity and efficiency than photography (A)</p> Signup and view all the answers

Which of the following best describes a CCD?

<p>A device made up of photosensitive detectors used to produce better images of celestial objects (D)</p> Signup and view all the answers

Photometry is different from photography because it

<p>Measures the brightness of celestial objects more precisely using electric current (A)</p> Signup and view all the answers

What is the purpose of a spectrograph in spectroscopy?

<p>To disperse light and create a spectrum (D)</p> Signup and view all the answers

What are emission and absorption lines in spectroscopy?

<p>Distinct patterns of brightness in a spectrum that correspond to specific chemical elements or molecules (B)</p> Signup and view all the answers

Why is a slit used in spectroscopy?

<p>To restrict the light entering the spectrograph to a small area of the sky (D)</p> Signup and view all the answers

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