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