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?

Consider a large interferometer that uses a lazer with the wavelength of 1,073.27 nm (1073.27 x 10-9m). What is the frequency of the photons emitted by this beam in hertz?

(1) 6. (5) The Hubble Space Telescope orbits the Earth every 95 minutes, taking breathtaking images of our universe. Calculate its altitude above the Earth's Surface. Fc N 47₁1² T2 r ? 11 G GM = 3√T²2GM G₂

For a human eye with a pupil diameter (aperture diameter D) of 0.005 meters, and a focal length of 0.022 meters, there will be a resolution limit due to diffraction at 0.6 microns (10^-6 meters) wavelength. If we space light-sensitive cells on the retina at this spacing, how many retina cells per meter (of retina) are there? cells/meter. Now suppose there are giants which are exactly twice the size of humans in each dimension. So giant eyes have pupils of 0.01 meters, and a focal length of 0.044 meters. How many retina cells per meter should the giants have? cells/meter

Give the peak wavelengths, λpeak, for each of the following cases. State which portion of the electromagnetic spectrum it falls within. The red giant star Betelgeuse, with T = 3600 K. (In nm.)

Cas A SNR North Lobe Chandra ACIS image (M. Stage) region of spectrum-> 10* km/s (be sure to convert your answer to kilometers!) (Enter a positive value--if you get a negative answer ignore the minus sign.) 1000 100 Combine counts / Ang./ (0.964324 sq. arcsec) 10 1 0.1 Cas A Ms Spectrum from 4362.5 4458.5, region size 0.964324 sq. arcsec Silicon line werden der 5 10 20 Wavelength (Angstroms) The speed of the material ejected in a supernova can be measured by using the Doppler shift of the X-ray emission lines in its spectrum. The images above show real X ray data of the Cassiopeia A supernova remnant and a spectrum extracted from that data--you can see several emission lines including the silicon line near 6.6 angstroms (0.66 nm). If the emission line created by silicon normally has a wavelength of 0.6648 nm (nanometers), but is measured in the spectrum to have a wavelength of 0.6599 nm, how fast is the gas moving?

humans can typically see light in the range of 400 to 700 nm. however, some animals can see wavelengths outside of this range. for instance bees and some spiders can see ultraviolet light, while snakes and other reptiles have vision extending to the infrared wavelengths. what adaptive advantages might this extended vision offer these animals

Calculate the angular resolution of radio interferometer with a base line of 10000 km and an operating wavelength of 0.1 m.

What is the limit of angular resolution for a 6.3-m telescope at a wavelength of 533nm?