Exploring the Cosmos - Degree Exam 2008 - Mapping the Universe

1. A Cassegrain telescope

has a short focal length.

is not a widely used optical design.

has a wide field of view.

is a common optical design used at modern observatories.

2. Infra red detectors can work by measuring

the temperature rise in a material.

radioactive particles.

energetic charged particles.

Cerenkov radiation.

3. Wave particle-duality relates to

infra-red radiation.

UV radiation.

all of the above.

visible radiation.

4. The International Ultraviolet Explorer (IUE) experiment

is not a space mission.

has since finished operation.

is currently in orbit.

is currently being built.

5. Scintillation detectors can be made from

stainless steel.

aluminium.

wood.

water.

6. The typical wavelength of an X-ray photon is

1.5 µm.

50 nm.

600 nm.

0.1 nm.

7. A light wave with large amplitude has a

high brightness.

high frequency.

low brightness.

long wavelength.

8. Radio telescopes

require a very smooth surface.

operate only at night.

need to be cooled.

do not require a very smooth surface.

9. The ISO satellite is sensitive to

UV.

X-rays.

IR.

Gamma rays.

10. A Newtonian telescope utilises a

flat secondary mirror.

corrector plate.

lens.

curved secondary mirror.