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Galactic Infrared and Submillimeter Emission

Description: Test your knowledge on Galactic Infrared and Submillimeter Emission with these challenging questions.
Number of Questions: 15
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Tags: astrophysics galactic infrared submillimeter emission
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What is the primary source of infrared and submillimeter emission in our galaxy?

  1. Interstellar Dust

  2. Stars

  3. Planets

  4. Nebulae

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Correct Option: A
Explanation:

Interstellar dust, composed of tiny particles of graphite and silicate, absorbs and re-emits starlight as infrared and submillimeter radiation.

Which infrared wavelength range is commonly referred to as the 'mid-infrared'?

  1. 1-5 μm

  2. 5-20 μm

  3. 20-100 μm

  4. 100-1000 μm

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Correct Option: B
Explanation:

The mid-infrared range typically spans from 5 to 20 μm and is often used to study interstellar dust and molecular clouds.

What is the primary mechanism responsible for the emission of submillimeter radiation from galaxies?

  1. Thermal Emission

  2. Synchrotron Radiation

  3. Bremsstrahlung

  4. Compton Scattering

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Correct Option: A
Explanation:

Thermal emission from interstellar dust is the dominant mechanism for submillimeter radiation in galaxies.

Which of the following is NOT a major component of interstellar dust?

  1. Graphite

  2. Silicate

  3. Water Ice

  4. Polycyclic Aromatic Hydrocarbons (PAHs)

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Correct Option: C
Explanation:

Water ice is not a major component of interstellar dust, although it can be found in some regions.

What is the name of the infrared space telescope launched by NASA in 2003 to study the infrared universe?

  1. Hubble Space Telescope

  2. Chandra X-ray Observatory

  3. Spitzer Space Telescope

  4. James Webb Space Telescope

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Correct Option: C
Explanation:

The Spitzer Space Telescope was specifically designed to study the infrared universe and operated from 2003 to 2020.

What is the name of the submillimeter space telescope launched by ESA in 2010?

  1. Herschel Space Observatory

  2. Planck Surveyor

  3. XMM-Newton

  4. INTEGRAL

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Correct Option: A
Explanation:

The Herschel Space Observatory was a submillimeter space telescope that operated from 2010 to 2013.

Which of the following is NOT a major region of infrared and submillimeter emission in our galaxy?

  1. Galactic Center

  2. Orion Nebula

  3. Taurus Molecular Cloud

  4. Andromeda Galaxy

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Correct Option: D
Explanation:

The Andromeda Galaxy is not a region of our galaxy and therefore does not contribute significantly to infrared and submillimeter emission.

What is the name of the infrared emission feature observed at a wavelength of 10 μm?

  1. PAH Emission Feature

  2. Silicate Emission Feature

  3. Water Ice Emission Feature

  4. Carbon Monoxide Emission Line

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Correct Option: A
Explanation:

The PAH Emission Feature is a prominent feature in the infrared spectrum of galaxies and is attributed to the emission from Polycyclic Aromatic Hydrocarbons (PAHs).

What is the name of the submillimeter emission feature observed at a wavelength of 850 μm?

  1. PAH Emission Feature

  2. Silicate Emission Feature

  3. Water Ice Emission Feature

  4. Carbon Monoxide Emission Line

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Correct Option: C
Explanation:

The Water Ice Emission Feature is a prominent feature in the submillimeter spectrum of galaxies and is attributed to the emission from water ice.

What is the name of the submillimeter emission feature observed at a wavelength of 350 μm?

  1. PAH Emission Feature

  2. Silicate Emission Feature

  3. Water Ice Emission Feature

  4. Carbon Monoxide Emission Line

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Correct Option: B
Explanation:

The Silicate Emission Feature is a prominent feature in the submillimeter spectrum of galaxies and is attributed to the emission from silicate dust.

What is the name of the infrared emission line observed at a wavelength of 12.8 μm?

  1. PAH Emission Feature

  2. Silicate Emission Feature

  3. Water Ice Emission Feature

  4. Neon Emission Line

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Correct Option: D
Explanation:

The Neon Emission Line is a prominent feature in the infrared spectrum of galaxies and is attributed to the emission from ionized neon.

What is the name of the infrared emission line observed at a wavelength of 6.2 μm?

  1. PAH Emission Feature

  2. Silicate Emission Feature

  3. Water Ice Emission Feature

  4. Polycyclic Aromatic Hydrocarbons (PAHs)

Show answer
Correct Option: D
Explanation:

The Polycyclic Aromatic Hydrocarbons (PAHs) Emission Line is a prominent feature in the infrared spectrum of galaxies and is attributed to the emission from PAHs.

What is the name of the infrared emission line observed at a wavelength of 3.3 μm?

  1. PAH Emission Feature

  2. Silicate Emission Feature

  3. Water Ice Emission Feature

  4. Carbon Monoxide Emission Line

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Correct Option: D
Explanation:

The Carbon Monoxide Emission Line is a prominent feature in the infrared spectrum of galaxies and is attributed to the emission from carbon monoxide.

What is the name of the infrared emission line observed at a wavelength of 2.1 μm?

  1. PAH Emission Feature

  2. Silicate Emission Feature

  3. Water Ice Emission Feature

  4. Hydrogen Emission Line

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Correct Option: D
Explanation:

The Hydrogen Emission Line is a prominent feature in the infrared spectrum of galaxies and is attributed to the emission from hydrogen.

What is the name of the infrared emission line observed at a wavelength of 1.6 μm?

  1. PAH Emission Feature

  2. Silicate Emission Feature

  3. Water Ice Emission Feature

  4. Sulfur Emission Line

Show answer
Correct Option: D
Explanation:

The Sulfur Emission Line is a prominent feature in the infrared spectrum of galaxies and is attributed to the emission from ionized sulfur.

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