Understanding Detectors and Human Eyes

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What is the primary purpose of a detector as explained in the text?

To study celestial objects that are too bright for the human eye to see
To measure light after it has been brought into focus (correct)
To capture images quickly like a camera
To replace the human eye in detecting mushrooms

Why do astronomers use long exposure times when photographing celestial objects with a telescope?

To capture images more quickly than with short exposures
To observe objects that are too bright for telescopes
To allow for better images of faint celestial objects (correct)
To match the exposure times of regular cameras

How are photography and telescopes related based on the text?

Photography cannot be done using telescopes
Photographic plates or film cannot be placed in the focal plane of a telescope
Telescopes can only be used for photography purposes
Telescopes can act like cameras by using photographic plates or film (correct)

What distinguishes detectors from the human eye as explained in the text?

Detectors are more qualitative and sensitive than human eyes (B) Signup and view all the answers

Why is it mentioned that astronomers sometimes use very short exposures?

To study how celestial objects vary quickly (B) Signup and view all the answers

In what way can a telescope be used similarly to a camera according to the text?

By placing photographic plates or film in its focal plane (D) Signup and view all the answers

What is the main difference between human eyes and detectors discussed in the text?

Detectors are more sensitive and objective than human eyes (B) Signup and view all the answers

What is the main advantage of using a CCD over photography for recording images of celestial objects?

CCDs are more sensitive to faint light than photographic film. (C) Signup and view all the answers

What is the purpose of the slit in a spectrograph?

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

What is the main purpose of spectroscopy in astronomy?

To determine the chemical composition of celestial objects. (A) Signup and view all the answers

How are spectral lines in spectroscopy related to chemical elements and molecules?

Spectral lines are unique to the specific chemical elements and molecules present in a celestial body. (C) Signup and view all the answers

What is the main difference between photometry and spectroscopy in astronomy?

Photometry measures the overall brightness of celestial objects, while spectroscopy measures their brightness by wavelength. (A) Signup and view all the answers

What is the main purpose of a spectrograph in astronomical spectroscopy?

To record the spectrum of a celestial object. (C) Signup and view all the answers

How does the slit in a spectrograph help to improve the quality of the spectral measurements?

The slit allows the spectrograph to focus on a specific region of the celestial object, reducing interference from other parts of the object. (C) Signup and view all the answers

What is the primary advantage of using a CCD over photographic film for astronomical imaging?

CCDs are more sensitive to faint light, allowing for better imaging of distant and dim celestial objects. (B) Signup and view all the answers

Understanding Detectors and Human Eyes

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