21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 6, Problem 5QP
To determine
The reason for better resolution of a set of radio telescopes than a single dish telescope.
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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.
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.
A diffraction-limited telescope with a 7.6-cm aperture is aimed at target 12.5 km away. Assuming light
of 500 nm wavelength and neglecting air turbulence, determine the size of details can be resolved by
the telescope.
O A. 20 cm.
B. 5 cm
c. 15 cm
O D. 10 cm
Chapter 6 Solutions
21st Century Astronomy
Ch. 6.1 - Prob. 6.1ACYUCh. 6.1 - Prob. 6.1BCYUCh. 6.2 - Prob. 6.2CYUCh. 6.3 - Prob. 6.3CYUCh. 6.4 - Prob. 6.4CYUCh. 6.5 - Prob. 6.5CYUCh. 6 - Prob. 1QPCh. 6 - Prob. 2QPCh. 6 - Prob. 3QPCh. 6 - Prob. 4QP
Ch. 6 - Prob. 5QPCh. 6 - Prob. 6QPCh. 6 - Prob. 7QPCh. 6 - Prob. 8QPCh. 6 - Prob. 9QPCh. 6 - Prob. 10QPCh. 6 - Prob. 11QPCh. 6 - Prob. 12QPCh. 6 - Prob. 13QPCh. 6 - Prob. 14QPCh. 6 - Prob. 15QPCh. 6 - Prob. 16QPCh. 6 - Prob. 17QPCh. 6 - Prob. 18QPCh. 6 - Prob. 19QPCh. 6 - Prob. 20QPCh. 6 - Prob. 21QPCh. 6 - Prob. 22QPCh. 6 - Prob. 23QPCh. 6 - Prob. 24QPCh. 6 - Prob. 25QPCh. 6 - Prob. 26QPCh. 6 - Prob. 27QPCh. 6 - Prob. 28QPCh. 6 - Prob. 29QPCh. 6 - Prob. 30QPCh. 6 - Prob. 31QPCh. 6 - Prob. 32QPCh. 6 - Prob. 33QPCh. 6 - Prob. 34QPCh. 6 - Prob. 35QPCh. 6 - Prob. 36QPCh. 6 - Prob. 37QPCh. 6 - Prob. 38QPCh. 6 - Prob. 39QPCh. 6 - Prob. 40QPCh. 6 - Prob. 41QPCh. 6 - Prob. 42QPCh. 6 - Prob. 43QPCh. 6 - Prob. 44QPCh. 6 - Prob. 45QP
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- 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.arrow_forwardWhy are there limits to the resolving power of a telescope? A The aperture is a double slit. B The aperture is a slit with two edges. C The aperture through which the light passes limits the amount of light that forms the image. D The aperture through which the light passes diffracts the light and blurs the image.arrow_forwardIf the separation of two telescopes comprising an interferome- ter is doubled, the angular separation between two sources just barely resolvable by the interferometer will a. not change. b. decrease by a factor of 1/V/2. c. halve. d. double.arrow_forward
- 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.arrow_forwardThe 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.arrow_forwardRadio waves have wavelengths that are typically many centimeters, or even meters. Radio telescopes also tend to have diameters that are much larger than optical telescopes. They are sometimes 25, 50, even 100 m in diameter. In fact, the Arecibo radio telescope in Puerto Rico is about 300 m in diameter. How does the resolution of the Arecibo telescope observing radio waves of wavelength 10 cm compare to that of a 1-m diameter optical telescope observing in green light with a wavelength of 500 nm? Explain why radio telescopes are so large.arrow_forward
- 3. As seen by an observer on Earth, two stars are separated by an angle of 0.0005°. What is the minimum diameter of a telescope required for an Earth astronomer to see two separate stars? (Assume a circular aperture and an average wavelength for the light of 500 nm.) 4. Sound waves of 675 Hz travel at a speed of 345 m/s through a doorway in a soundproof wall. If the doorway is 1.5 m wide, how many "quiet spots" (locations where no sound is heard") will there be along a line parallel to the wall? What will be the angular location of these quiet spots?arrow_forwarda. What is the resolving power (in arc seconds) of a 84 cm (33 in.) telescope at a wavelength of 560 nm? b. What do two stars 1.5 arc seconds apart look like through this telescope? - The two points of light are well separated from each other. -The two points of light are only just separated from each other — they are distinguishable but appear to touch. - The two points of light are indistinguishable from each other.arrow_forwardIf the diameter of a radar dish is doubled, what happens to its resolving power, assuming that all other factors remain unchanged? a. The resolving power quadruples. b.The resolving power doubles. c. The resolving power is reduced to 1/2 of its original value. d. The resolving power is reduted to 1/4 of its original value. e.The resolving power does/not change unless the focal length changes. f.None of the abovearrow_forward
- 10. Capella Space is a company that launches and operates satellites. This company's satellites collect global images that are of significantly higher resolution than images collected by other satellites. The images are formed by the satellite transmitting and 'bouncing' microwave signals off the Earth, with the image formed from the returning signals. Unlike optical technology (which uses ambient visible light from the Sun which reflects off the Earth), microwaves allows the telescope to 'see' through smoke, clouds, or air pollution, and the images can also be collected at night. The images are collected each hour and allow scientists to constantly monitor the Earth and to respond to environmental challenges such as oil spills, forest fires, and crop production levels. Capella Space is part of the Space Net™ partnership that provides satellite imagery for researchers and developers to use in the fields of conservation, security services, and mapping. An example of Capella's high-res…arrow_forwardWhich 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.arrow_forward5. A diffraction-limited telescope with a 7.6 cm aperture is aimed at target 12.5 km away. Assuming light of 580 nm wavelength and neglecting air turbulence, what size details can be resolved by the telescope? A) 8.2 cm B) 10.0 cm C) 11.3 cm D) 12.43 cm E) 12.88 cmarrow_forward
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