The Very Long Baseline Array (VLBA) is a. the highest resolution optical telescope ever built. b. located in Arecibo, Puerto Rico. c. a matched pair of 8-meter telescopes, one of which is in Chile and the other in Hawaii. d. an airborne infrared telescope. e. a set of radio telescopes linked together electronically to provide very high resolution

The Very Long Baseline Array (VLBA) is a. the highest resolution optical telescope ever built. b. located in Arecibo, Puerto Rico. c. a matched pair of 8-meter telescopes, one of which is in Chile and the other in Hawaii. d. an airborne infrared telescope. e. a set of radio telescopes linked together electronically to provide very high resolution

Horizons: Exploring the Universe (MindTap Course List)

14th Edition

ISBN:9781305960961

Author:Michael A. Seeds, Dana Backman

Publisher:Michael A. Seeds, Dana Backman

Chapter5: Light And Telescopes

Section: Chapter Questions

Problem 4P

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Radio telescopes have poor resolving power because a. their diameters are so large. b. the energy they receive is not electromagnetic radiation. c. radio waves have long wavelengths. d. a and b are true. e. none of the above are true.
The Hubble Space Telescope, orbiting above Earth’s atmosphere, eliminates the blurring effect of Earth’s atmosphere and permits the telescope to a. observe gamma rays. b. observe wavelengths from the near infrared to the near ultraviolet. c. receive radio wavelengths. d. transmit radar pulses that reflect off the surface of the moon.
Which of the following describes interferometry? a. It is used to improve resolving power. b. It decreases the chromatic aberration of a telescope. c. It works only for large X-ray and ultraviolet telescopes. d. It requires that radio telescopes be within a few hundred feet of each other. e. None of the above statements are true.
A device that analyzes light by spreading it out according to wavelength is called a(n) a. interferometer. b. camera. c. photometer. d. spectrograph.
Why do radar satellites typically use a sun-synchronous, dawn-dusk orbit? A. To optimize the collection geometry for higher resolution images. B. To maintain a constant solar zenith angle on the targets. C. To maximize the access time for ground targets. D. To maximize the available power to the solar panels.
In a radio interferometer with two dishes, the distance between the two dishes determines the a. magnifying power b. light-gathering power. c. resolving power. d. level of interference from terrestrial radio sources. e. energy distribution.
One of the disadvantages of a radio telescope compared to a reflecting optical telescope is its inability to a. reveal finer detail. b. detect cool hydrogen. c. see through interstellar dust. d. see some of the most distant objects in the universe.
7) What is the angular resolution of a 5-meter lens diameter telescope at a wavelength of 500 nm? a. 1.22x10^-7 b. 1.22x10^-6 c. 2.44x10^-7 d. 2.44x10^-6
1. A star in a distant galaxy approaches the Sun at 3 X 106 m/s. It emits a photon with a wavelength of 0.4 microns. Apply the Doppler Effect to estimate the observed wavelength of this photon. 2. An object is 2 meters from a thin lens with a focal length of 50 cm. Apply the thin-lens equation to calculate the image distance from the lens and magnification.
The main reason for creating an interferometer with two separate radio dishes is to a. monitor two different radio wavelengths simultaneously. b. increase the intensity of the detected signal. c. compare objects in two different directions simultaneously. d. increase the resolution in the data.
Which of the following is NOT a limitation associated with radio telescopes? a. a short focal length b. poor resolution c. low-intensity radiation d. interference e. none of the above
Which of these does NOT describe an effect of the atmosphere on astronomical observation? Answers: A. Filtering out infrared and other wave bands. B. Unsteady or turbulent air. C. Decreased light-gathering power. D. Scattering light from nearby cities. E. Weather conditions.

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	a.	the highest resolution optical telescope ever built.
	b.	located in Arecibo, Puerto Rico.
	c.	a matched pair of 8-meter telescopes, one of which is in Chile and the other in Hawaii.
	d.	an airborne infrared telescope.
	e.	a set of radio telescopes linked together electronically to provide very high resolution.