How Is Interferometry Used in Radio Astronomy

question 237

Multiple Choice

How is interferometry used in radio astronomy?

• A) Signals from a radio source are combined with an equivalent signal delayed in time to produce interference, thereby increasing the angular resolution of the telescope.
• B) Signals from different places around the dish of a radio telescope are combined to produce interference and increase the angular resolution of the telescope.
• C) Signals from two or more different radio telescopes are combined to produce a single image of greater angular resolution than from any one telescope alone.
• D) Signals from different parts of a radio source are combined to increase the angular resolution of the telescope.

---

Definitions:

Quartzite

A very hard rock consisting chiefly of quartz grains joined by secondary silica that causes the rock to break across rather than around the grains; formed by metamorphism or by silica cementation of a quartz sandstone.

Slate

A compact, fine-grained, low-grade metamorphic rock that possesses slaty cleavage.

Hornfels

Hornfels is a metamorphic rock formed by the contact between mudstone or other clay-rich rock and a hot igneous body, characterized by its hardness and fine grain.

Greenstone

Metamorphosed basalt or other mafic volcanic rock, typically found in ancient geological formations.