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