ng.com Kansas State University-PHYS114-Spring 18-WYSIN: hw11: Photons & Matt ty-

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ng.com Kansas State University-PHYS114-Spring 18-WYSIN: hw11: Photons & Matt ty- PHYS114-Spring18-WYSIN Activities and Due Dates hw11: Photons & Matter Waves 9/2018 11:59 PM Ao/10 Print Cakcu'ator Gradebo Periodic Table on 2 of 11 nstax College Physics Map presented by Sapling Leaming The 305 m diameter Arecibo radio telescope detects radio waves with wavelengths from 3 to 100 cm. What is the angle between two just-resolvable 5.00 cm wavelength point sources for this telescope? Number rad How close together could these point sources be at the 2.56 million light year distance of the Andromeda galaxy (M31)? The Arecibo radio telescope. Number Lv Previous Gi Up& View Soution Check Answer NextExit

Explanation / Answer

from the Raley criterian formula

theta = 1.22 lamda/D

=1.22 (5 * 10^-2)/305

= 0.0002 rad

(b)

distance between the two sources is

s = vt

= 2.56 * 10^6 Ly (0.0002 rad)

= 512 Ly

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