Exploring the Cosmos - Degree Exam 2008 - Mapping the Universe
1. A Cassegrain telescope
has a short focal length.
is a common optical design used at modern observatories.
has a wide field of view.
is not a widely used optical design.
2. Infra red detectors can work by measuring
Cerenkov radiation.
energetic charged particles.
radioactive particles.
the temperature rise in a material.
3. Wave particle-duality relates to
all of the above.
visible radiation.
UV radiation.
infra-red radiation.
4. The International Ultraviolet Explorer (IUE) experiment
is currently in orbit.
has since finished operation.
is not a space mission.
is currently being built.
5. Scintillation detectors can be made from
water.
wood.
aluminium.
stainless steel.
6. The typical wavelength of an X-ray photon is
1.5 µm.
0.1 nm.
600 nm.
50 nm.
7. A light wave with large amplitude has a
high brightness.
low brightness.
high frequency.
long wavelength.
8. Radio telescopes
do not require a very smooth surface.
need to be cooled.
require a very smooth surface.
operate only at night.
9. The ISO satellite is sensitive to
Gamma rays.
UV.
IR.
X-rays.
10. A Newtonian telescope utilises a
corrector plate.
flat secondary mirror.
lens.
curved secondary mirror.
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