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