6. The Very Long Baseline Array radio interferometer (VLBA) hasa longest baseline of 8000 km and can operate at frequencies ashigh as 44 GHz. The Keck interferometer has a baseline of 100 m andoperates at a near-infrared wavelength of 2 micron. (a) Whichinstrument has the highest angular resolution (smallest diffractionangle)? (b) For the VLBA, what is the smallest distance two radiotransmitters could be on the Moon that could still be discerned?Use a lunar distance of 384,000 km.
