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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?

To capture faint celestial objects that are not visible to the naked eye Signup and view all the answers

What are CCDs used for in astronomy?

To capture images with higher sensitivity and efficiency than photography Signup and view all the answers

Which of the following best describes a CCD?

A device made up of photosensitive detectors used to produce better images of celestial objects Signup and view all the answers

Photometry is different from photography because it

Measures the brightness of celestial objects more precisely using electric current Signup and view all the answers

What is the purpose of a spectrograph in spectroscopy?

To disperse light and create a spectrum Signup and view all the answers

What are emission and absorption lines in spectroscopy?

Distinct patterns of brightness in a spectrum that correspond to specific chemical elements or molecules Signup and view all the answers

Why is a slit used in spectroscopy?

To restrict the light entering the spectrograph to a small area of the sky Signup and view all the answers