# Homework Help: Radio Telescope at Arecibo, Puerto Rico

1. Apr 4, 2009

### JSapit

Minimum Resolution Angle Problem

1. The problem statement, all variables and given/known data

The radio telescope at Arecibo, Puerto Rico, has a reflecting spherical bowl of 295 m diameter. Radio signals can be received and emitted at various frequencies with appropriate antennae at the focal point of the reflecting bowl. At a frequency of 300 MHz, what is the angle between two stars that can barely be resolved?

2. Relevant equations

(theta)min=1.22(lambda)/d

Lambda=(3.0E8)/(frequency)

3. The attempt at a solution

I tried converting the frequency to wavelength, and then plugging the wavelength, which I found to be 1m, and the given information into the first equation that I wrote down. The answer that I entered, .004136, wasn't correct, so I'm not sure if it's a wrong unit conversion, or I'm doing this wrong. First off, is the answer that I found in degrees? If it is, then would I need to convert it to radians? Secondly, what do they mean by mrads? Is it milli-radians?

Thank you.

Last edited: Apr 4, 2009
2. Apr 5, 2009

### Kurdt

Staff Emeritus