Exploring the Cosmos - Degree Exam 2007 - Mapping the Universe
1. A prime focus telescope represents a feasible optical configuration
for amateur telescopes.
when the diameter of the prime mirror is very large.
when interference is used.
when the focal length is very long.
2. Which of the following parameters is the same for all electromagnetic waves propagating in a vacuum?
Speed
Amplitude
Wavelength
Colour
3. Which of the following statements correctly describes the wavelength of an electromagnetic wave?
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 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 light spectrum.
improve the magnification.
improve the resolution.
improve the light gathering.
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 the amplitude is reduced.
Because the frequency increases.
Because it interferes with the surface.
6. A Newtonian telescope has
just the primary mirror
a flat secondary mirror
a diverging secondary mirror
a correction plate
7. With respect to a dim light, a bright light emits
photons with longer wavelength.
photons with higher amplitude.
more photons.
photons with shorter 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 horizon.
to improve the magnification.
to not be limited by the Earth’s atmosphere.
9. An electromagnetic wave with a wavelength of 100 nm is
visible radiation.
IR radiation.
UV radiation.
microwave radiation.
10. The angular size of the Moon is
1 800 arcminutes
1 800 arcseconds
1.8 degrees
18 degrees
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