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