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
radioactive particles.
Cerenkov radiation.
energetic charged 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 not a space mission.
is currently in orbit.
has since finished operation.
is currently being built.
5. Scintillation detectors can be made from
water.
aluminium.
stainless steel.
wood.
6. The typical wavelength of an X-ray photon is
50 nm.
1.5 µm.
600 nm.
0.1 nm.
7. A light wave with large amplitude has a
long wavelength.
high frequency.
low brightness.
high brightness.
8. Radio telescopes
operate only at night.
do not require a very smooth surface.
require a very smooth surface.
need to be cooled.
9. The ISO satellite is sensitive to
IR.
X-rays.
Gamma rays.
UV.
10. A Newtonian telescope utilises a
flat secondary mirror.
lens.
curved secondary mirror.
corrector plate.
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