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Photometry: Measuring the Brightness of Stars and Galaxies

Description: This quiz is designed to assess your understanding of Photometry, the branch of astronomy that deals with the measurement of the brightness of stars and galaxies.
Number of Questions: 10
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Tags: photometry astronomy stars galaxies brightness
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What is the fundamental unit of measurement in photometry?

  1. Candela

  2. Lumen

  3. Lux

  4. Watt

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Correct Option: A
Explanation:

The candela is the SI unit of luminous intensity, which is the measure of the luminous power emitted by a light source in a particular direction.

What is the difference between apparent magnitude and absolute magnitude?

  1. Apparent magnitude is the brightness of a star as seen from Earth, while absolute magnitude is the brightness of a star if it were placed at a standard distance of 10 parsecs.

  2. Apparent magnitude is the brightness of a star as seen from Earth, while absolute magnitude is the brightness of a star if it were placed at a standard distance of 10 light-years.

  3. Apparent magnitude is the brightness of a star as seen from Earth, while absolute magnitude is the brightness of a star if it were placed at a standard distance of 10 kilometers.

  4. Apparent magnitude is the brightness of a star as seen from Earth, while absolute magnitude is the brightness of a star if it were placed at a standard distance of 10 miles.

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Correct Option: A
Explanation:

Apparent magnitude is affected by the distance to the star, while absolute magnitude is a measure of the star's intrinsic brightness.

What is the relationship between apparent magnitude and distance?

  1. Apparent magnitude decreases as distance increases.

  2. Apparent magnitude increases as distance increases.

  3. Apparent magnitude is independent of distance.

  4. Apparent magnitude is inversely proportional to distance.

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Correct Option: A
Explanation:

The farther away a star is, the dimmer it appears, so its apparent magnitude decreases as distance increases.

What is the inverse square law of light?

  1. The intensity of light is inversely proportional to the square of the distance from the light source.

  2. The intensity of light is directly proportional to the square of the distance from the light source.

  3. The intensity of light is inversely proportional to the distance from the light source.

  4. The intensity of light is directly proportional to the distance from the light source.

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Correct Option: A
Explanation:

This law states that the intensity of light decreases as the square of the distance from the light source increases.

What is a photometer?

  1. A device used to measure the brightness of stars and galaxies.

  2. A device used to measure the distance to stars and galaxies.

  3. A device used to measure the temperature of stars and galaxies.

  4. A device used to measure the mass of stars and galaxies.

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Correct Option: A
Explanation:

Photometers are used to measure the intensity of light from celestial objects.

What are the different types of photometers?

  1. CCD photometers, photomultiplier tubes, and bolometers.

  2. CCD photometers, spectrometers, and bolometers.

  3. CCD photometers, photomultiplier tubes, and interferometers.

  4. CCD photometers, spectrometers, and interferometers.

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Correct Option: A
Explanation:

CCD photometers, photomultiplier tubes, and bolometers are the most common types of photometers used in astronomy.

What is the difference between a CCD photometer and a photomultiplier tube?

  1. CCD photometers are used to measure the brightness of faint objects, while photomultiplier tubes are used to measure the brightness of bright objects.

  2. CCD photometers are used to measure the brightness of bright objects, while photomultiplier tubes are used to measure the brightness of faint objects.

  3. CCD photometers are used to measure the brightness of objects at visible wavelengths, while photomultiplier tubes are used to measure the brightness of objects at infrared wavelengths.

  4. CCD photometers are used to measure the brightness of objects at infrared wavelengths, while photomultiplier tubes are used to measure the brightness of objects at visible wavelengths.

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Correct Option: A
Explanation:

CCD photometers are more sensitive than photomultiplier tubes, so they can be used to measure the brightness of fainter objects.

What is a bolometer?

  1. A device used to measure the brightness of stars and galaxies at infrared wavelengths.

  2. A device used to measure the distance to stars and galaxies.

  3. A device used to measure the temperature of stars and galaxies.

  4. A device used to measure the mass of stars and galaxies.

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Correct Option: A
Explanation:

Bolometers are used to measure the intensity of infrared radiation from celestial objects.

What is the difference between photometry and spectroscopy?

  1. Photometry measures the brightness of celestial objects, while spectroscopy measures the composition of celestial objects.

  2. Photometry measures the distance to celestial objects, while spectroscopy measures the composition of celestial objects.

  3. Photometry measures the temperature of celestial objects, while spectroscopy measures the composition of celestial objects.

  4. Photometry measures the mass of celestial objects, while spectroscopy measures the composition of celestial objects.

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Correct Option: A
Explanation:

Photometry and spectroscopy are two different techniques used to study celestial objects.

What is the importance of photometry in astronomy?

  1. Photometry is used to determine the distance to stars and galaxies.

  2. Photometry is used to determine the composition of stars and galaxies.

  3. Photometry is used to determine the temperature of stars and galaxies.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

Photometry is used to determine the distance, composition, and temperature of stars and galaxies.

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