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