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