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Interferometry: Combining Telescopes for Enhanced Resolution

Description: Test your understanding of interferometry, a technique used to combine multiple telescopes to achieve higher resolution and sensitivity.
Number of Questions: 15
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Tags: astronomy telescopes interferometry resolution sensitivity
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What is the primary advantage of using interferometry in astronomy?

  1. Increased magnification

  2. Enhanced resolution

  3. Improved light-gathering power

  4. Reduced background noise


Correct Option: B
Explanation:

Interferometry allows astronomers to achieve much higher angular resolution than is possible with a single telescope, enabling them to study fine details and structures in astronomical objects.

What is the fundamental principle behind interferometry?

  1. Combining the light waves from multiple telescopes

  2. Increasing the diameter of a single telescope

  3. Reducing the wavelength of the observed light

  4. Eliminating atmospheric turbulence


Correct Option: A
Explanation:

Interferometry works by combining the light waves collected by multiple telescopes, allowing astronomers to synthesize a larger aperture and achieve finer resolution.

What is the term used to describe the distance between the individual telescopes in an interferometer?

  1. Baseline length

  2. Aperture diameter

  3. Focal length

  4. Magnification factor


Correct Option: A
Explanation:

The baseline length is the distance between the individual telescopes in an interferometer. It determines the angular resolution and sensitivity of the interferometer.

What is the Michelson interferometer primarily used for?

  1. Measuring the speed of light

  2. Detecting gravitational waves

  3. Studying stellar spectra

  4. Imaging exoplanets


Correct Option: A
Explanation:

The Michelson interferometer is a classic interferometer design commonly used for precise measurements, including the determination of the speed of light.

Which type of interferometer is designed to measure the positions and motions of stars with high accuracy?

  1. Michelson interferometer

  2. Fabry-Perot interferometer

  3. Fizeau interferometer

  4. Long-baseline interferometer


Correct Option: D
Explanation:

Long-baseline interferometers are specifically designed for high-precision astrometry, allowing astronomers to measure the positions and motions of stars with great accuracy.

What is the primary challenge associated with long-baseline interferometry?

  1. Atmospheric turbulence

  2. Mechanical vibrations

  3. Stray light contamination

  4. Limited sensitivity


Correct Option: A
Explanation:

Atmospheric turbulence is a major challenge in long-baseline interferometry, as it can distort the light waves and degrade the image quality.

What is the Very Large Telescope Interferometer (VLTI) primarily used for?

  1. Studying the surfaces of planets

  2. Imaging black holes

  3. Detecting extragalactic radio sources

  4. Measuring the expansion of the universe


Correct Option: B
Explanation:

The VLTI is a powerful interferometer array located in Chile, primarily used for high-resolution imaging of astronomical objects, including black holes and their accretion disks.

What is the Event Horizon Telescope (EHT) designed to achieve?

  1. Imaging the surface of the Sun

  2. Detecting gravitational waves

  3. Studying the formation of stars

  4. Imaging the black hole at the center of our galaxy


Correct Option: D
Explanation:

The EHT is a global network of radio telescopes designed to achieve unprecedented resolution and image the black hole at the center of our galaxy, known as Sagittarius A*.

What is the primary goal of the Laser Interferometer Gravitational-Wave Observatory (LIGO)?

  1. Measuring the speed of light

  2. Detecting gravitational waves

  3. Studying the evolution of galaxies

  4. Imaging exoplanets


Correct Option: B
Explanation:

LIGO is a large-scale interferometer designed to detect gravitational waves, ripples in spacetime predicted by Einstein's theory of general relativity.

What is the primary advantage of using optical interferometry in astronomy?

  1. Increased magnification

  2. Enhanced resolution

  3. Improved light-gathering power

  4. Reduced background noise


Correct Option: B
Explanation:

Optical interferometry allows astronomers to achieve much higher angular resolution than is possible with a single telescope, enabling them to study fine details and structures in astronomical objects.

What is the fundamental principle behind optical interferometry?

  1. Combining the light waves from multiple telescopes

  2. Increasing the diameter of a single telescope

  3. Reducing the wavelength of the observed light

  4. Eliminating atmospheric turbulence


Correct Option: A
Explanation:

Optical interferometry works by combining the light waves collected by multiple telescopes, allowing astronomers to synthesize a larger aperture and achieve finer resolution.

What is the term used to describe the distance between the individual telescopes in an optical interferometer?

  1. Baseline length

  2. Aperture diameter

  3. Focal length

  4. Magnification factor


Correct Option: A
Explanation:

The baseline length is the distance between the individual telescopes in an optical interferometer. It determines the angular resolution and sensitivity of the interferometer.

What is the Michelson optical interferometer primarily used for?

  1. Measuring the speed of light

  2. Detecting gravitational waves

  3. Studying stellar spectra

  4. Imaging exoplanets


Correct Option: A
Explanation:

The Michelson optical interferometer is a classic interferometer design commonly used for precise measurements, including the determination of the speed of light.

Which type of optical interferometer is designed to measure the positions and motions of stars with high accuracy?

  1. Michelson optical interferometer

  2. Fabry-Perot optical interferometer

  3. Fizeau optical interferometer

  4. Long-baseline optical interferometer


Correct Option: D
Explanation:

Long-baseline optical interferometers are specifically designed for high-precision astrometry, allowing astronomers to measure the positions and motions of stars with great accuracy.

What is the primary challenge associated with long-baseline optical interferometry?

  1. Atmospheric turbulence

  2. Mechanical vibrations

  3. Stray light contamination

  4. Limited sensitivity


Correct Option: A
Explanation:

Atmospheric turbulence is a major challenge in long-baseline optical interferometry, as it can distort the light waves and degrade the image quality.

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