Exploring the Cosmos - Degree Exam 2007 - Mapping the Universe
1. A prime focus telescope represents a feasible optical configuration
when the diameter of the prime mirror is very large.
for amateur telescopes.
when the focal length is very long.
when interference is used.
2. Which of the following parameters is the same for all electromagnetic waves propagating in a vacuum?
Colour
Amplitude
Speed
Wavelength
3. Which of the following statements correctly describes the wavelength of an electromagnetic wave?
The wavelength is the distance travelled by the wave in a short time.
The wavelength is the distance travelled by the wave in 1 second.
The wavelength is the distance between a trough and a peak.
The wavelength is the distance between two consecutive peaks.
4. Interference between the light coming from different telescopes is used to
improve the resolution.
improve the light spectrum.
improve the light gathering.
improve the magnification.
5. Why does a light ray bend when it crosses the boundary between two different media at an oblique angle?
Because the speed of light changes.
Because it interferes with the surface.
Because the amplitude is reduced.
Because the frequency increases.
6. A Newtonian telescope has
a diverging secondary mirror
just the primary mirror
a correction plate
a flat secondary mirror
7. With respect to a dim light, a bright light emits
photons with longer wavelength.
photons with higher amplitude.
photons with shorter wavelength.
more photons.
8. The Hubble telescope was placed in space in order
to not be limited by the Earth’s atmosphere.
to be close to the stars.
to not be limited by the Earth’s horizon.
to improve the magnification.
9. An electromagnetic wave with a wavelength of 100 nm is
microwave radiation.
UV radiation.
IR radiation.
visible radiation.
10. The angular size of the Moon is
18 degrees
1 800 arcminutes
1 800 arcseconds
1.8 degrees
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