Exploring the Cosmos - Degree Exam 2014 - Mapping the Universe
1. Chromatic aberration can occur in a telescope because
light of different wavelengths are focussed to different positions.
the telescope is not stable.
the atmosphere is not stable.
light of different wavelengths are reflected to different positions.
2. The speed of light in a vacuum is approximately
300 million metres per second.
30 thousand metres per second.
30 million metres per second.
300 thousand metres per second.
3. The term 'refraction' is used to describe when light
changes frequency when transmitting through different media.
waves add together to produce brighter light.
changes direction when transmitting through different media.
bends around the edges of objects.
4. For an astronomical source, the focal length of a mirror is
the distance from the mirror to the focal point.
the distance from the mirror to an object.
the thickness of the mirror.
the diameter of the mirror.
5. Light can be described as having a "dual" nature. What does this mean?
It can go fast and slow.
It behaves like a wave and a particle.
It has brightness and wavelength.
It travels in two directions at the same time.
6. A Newtonian telescope is
a Cassegrain telescope.
a refracting telescope.
a reflecting telescope.
a prime focus telescope.
7. Astronomers hope to discover gravitational waves by
using highly-sensitive CCD sensors.
placing radio telescopes in space.
using laser interferometers.
detecting high-energy gamma rays.
8. During the day the sky appears blue because
the Sun changes colour over a period of 24 hours.
blue light is refracted less than red light.
the scattering of blue light is stronger than red light.
the atmosphere reflects more red light from the Sun during the day.
9. Atmospheric absorption causes
dimming or extinction of certain wavelengths of light.
the light from stars to appear stronger than it should.
the scattering of light with large wavelengths.
the stars to twinkle in appearance.
10. The resolving power of a radio telescope can be increased by
making observations during the night.
putting the telescope on a mountain.
increasing the diameter of the primary mirror.
decreasing the diameter of the primary mirror.
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