The 305-m-diameter Arecibo radio telescope pictured in Figure 4.20 detects radio waves with a 4.00-cm average wavelength. (a) What is the angle between two just-resolvable point sources for this telescope? (b) How close together could these point sources be at the 2 million light-year distance of the Andromeda Galaxy? Figure 4.20 A 305-m-diameter paraboloid at Arecibo in Puerto Rico is lined with reflective material, making it into a radio telescope. It is the largest curved focusing dish in the world. Although D for Arecibo is much larger than for the Hubble Telescope, it detects radiation of a much longer wavelength and its diffraction limit is significantly poorer than Hubble’s. The Arecibo telescope is still very useful, because important information is carried by radio waves that is not carried by visible light. (credit: Jeff Hitchcock)
The 305-m-diameter Arecibo radio telescope pictured in Figure 4.20 detects radio waves with a 4.00-cm average wavelength. (a) What is the angle between two just-resolvable point sources for this telescope? (b) How close together could these point sources be at the 2 million light-year distance of the Andromeda Galaxy? Figure 4.20 A 305-m-diameter paraboloid at Arecibo in Puerto Rico is lined with reflective material, making it into a radio telescope. It is the largest curved focusing dish in the world. Although D for Arecibo is much larger than for the Hubble Telescope, it detects radiation of a much longer wavelength and its diffraction limit is significantly poorer than Hubble’s. The Arecibo telescope is still very useful, because important information is carried by radio waves that is not carried by visible light. (credit: Jeff Hitchcock)
The 305-m-diameter Arecibo radio telescope pictured in Figure 4.20 detects radio waves with a 4.00-cm average wavelength. (a) What is the angle between two just-resolvable point sources for this telescope? (b) How close together could these point sources be at the 2 million light-year distance of the Andromeda Galaxy?
Figure 4.20 A 305-m-diameter paraboloid at Arecibo in Puerto Rico is lined with reflective material, making it into a radio telescope. It is the largest curved focusing dish in the world. Although D for Arecibo is much larger than for the Hubble Telescope, it detects radiation of a much longer wavelength and its diffraction limit is significantly poorer than Hubble’s. The Arecibo telescope is still very useful, because important information is carried by radio waves that is not carried by visible light. (credit: Jeff Hitchcock)
The 300 m diameter Arecibo radio telescope is observing the Andromeda galaxy at a wavelength of 14 cm.
Part (a) What is the angle between two just-resolvable stars for this telescope in radians?
Part (b) How close together could these point sources be at the 2.5 million light year distance of the Andromeda galaxy in ly?
The diameter of the Arecibo radio telescope is 307 m. It can image radio source that emit
electromagnetic waves with wavelength between 3 cm and 1 m.
The Virgo Cluster is a cluster of galaxies whose center is ~53.8 Mly away from us. Assume the
telescope is imaging at a wavelength of 63.3 cm and can just resolve two point sources of radio
waves in the Virgo cluster. How close together could these point sources be, i.e. what is the minim
distance between them in ly?
Enter an integer.
The 300 m diameter Arecibo radio telescope detects radio waves with a 7.37 cm average wavelength.
(a) What is the angle (in rad) between two just-resolvable point sources for this telescope?
1.6267e-4
rad
(b) How close together (in ly) could these point sources be at the 2 million light year distance of the Andromeda galaxy?
325.33
X ly
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