Aradio telescope has a circular collecting dish of diameter 5.0 m. it is used to observe two distant

galaxies that are both emitting electromagnetic radiation of wavelength 20 cm. the images of

the galaxies are just resolved by the telescope. what is the angle subtended by the galaxies at

the telescope?

a. 0.05 rad

b. 0.3 rad

c. 5 rad

d. 30 rad

Abox that has self-contained cable clamps holds two light switches. a two-wire no. 12 cable with ground feeds the box, and a pair of two-wire no. 12 cables (four conductors) with ground wires leaves the box to feed the light fixtures. the second switch is fed by a no. 12 jumper wire from the first switch. which one of the following box combinations would furnish the minimum allowable volume? a. two 3-inch × 2-inch × 21⁄2-inch gangable device boxes b. two 3-inch × 2-inch × 11⁄2-inch gangable device boxes c. two 3-inch × 2-inch × 23⁄4-inch gangable device boxes d. two 3-inch × 2-inch × 21⁄4-inch gangable device boxes