Astronomy Astronomy Telescopes and Instruments 1 — Questions and Answers
Question 1: What type of telescope uses mirrors to collect and focus light?
- Reflecting telescope (Correct answer)
- Refracting telescope
- Radio telescope
- X-ray telescope
Correct answer: Reflecting telescope
A reflecting telescope uses curved mirrors to collect and focus light, making it well-suited for viewing faint and distant objects.
Question 2: What does a spectrograph attached to a telescope measure?
- The wavelengths of light emitted by celestial objects (Correct answer)
- The distance to nearby stars using parallax
- The brightness of stars over time
- The proper motion of stars across the sky
Correct answer: The wavelengths of light emitted by celestial objects
A spectrograph disperses light into its component wavelengths, allowing astronomers to determine a celestial object's composition, temperature, and velocity.
Question 3: What is the primary advantage of space-based telescopes over ground-based ones?
- They avoid atmospheric distortion and absorption (Correct answer)
- They can use larger mirrors
- They are cheaper to build and maintain
- They have higher data transmission rates
Correct answer: They avoid atmospheric distortion and absorption
Space-based telescopes operate above Earth's atmosphere, avoiding the blurring effects of turbulence and the blocking of certain wavelengths like UV and X-rays.
Question 4: What technology do modern large telescopes use to correct for atmospheric blurring in real time?
- Adaptive optics (Correct answer)
- Charge-coupled devices (CCDs)
- Interferometry
- Coronagraphy
Correct answer: Adaptive optics
Adaptive optics systems use deformable mirrors and sensors to correct for atmospheric turbulence in real time, dramatically improving image sharpness.
Question 5: What is the unit used to measure the light-gathering power of a telescope related to its mirror diameter?
- Aperture (Correct answer)
- Focal length
- Magnification
- Field of view
Correct answer: Aperture
Aperture refers to the diameter of a telescope's primary mirror or lens, and larger apertures gather more light, enabling observation of fainter objects.
Question 6: Which type of telescope is best suited for studying the cold gas and dust in star-forming regions?
- Radio telescope (Correct answer)
- Optical telescope
- X-ray telescope
- Gamma-ray telescope
Correct answer: Radio telescope
Radio telescopes detect radio waves emitted by cold gas and dust in star-forming regions, which are invisible to optical telescopes.
Astronomy Astronomy Telescopes and Instruments 1
What type of telescope uses mirrors to collect and focus light?