Exploring the Cosmos - Degree Exam 2008 - Mapping the Universe

1. A Cassegrain telescope

has a short focal length.

has a wide field of view.

is not a widely used optical design.

is a common optical design used at modern observatories.

2. Infra red detectors can work by measuring

Cerenkov radiation.

radioactive particles.

the temperature rise in a material.

energetic charged particles.

3. Wave particle-duality relates to

infra-red radiation.

visible radiation.

UV radiation.

all of the above.

4. The International Ultraviolet Explorer (IUE) experiment

is not a space mission.

has since finished operation.

is currently being built.

is currently in orbit.

5. Scintillation detectors can be made from

aluminium.

wood.

water.

stainless steel.

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

600 nm.

1.5 µm.

0.1 nm.

50 nm.

7. A light wave with large amplitude has a

low brightness.

long wavelength.

high frequency.

high brightness.

8. Radio telescopes

operate only at night.

need to be cooled.

do not require a very smooth surface.

require a very smooth surface.

9. The ISO satellite is sensitive to

UV.

IR.

Gamma rays.

X-rays.

10. A Newtonian telescope utilises a

curved secondary mirror.

flat secondary mirror.

lens.

corrector plate.