Exploring the Cosmos - Degree Exam 2007 - Mapping the Universe
1. A prime focus telescope represents a feasible optical configuration
for amateur telescopes.
when the focal length is very long.
when interference is used.
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?
Speed
Colour
Wavelength
Amplitude
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 between two consecutive peaks.
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 light spectrum.
improve the resolution.
5. Why does a light ray bend when it crosses the boundary between two different media at an oblique angle?
Because it interferes with the surface.
Because the amplitude is reduced.
Because the speed of light changes.
Because the frequency increases.
6. A Newtonian telescope has
just the primary mirror
a flat secondary mirror
a correction plate
a diverging 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 improve the magnification.
to not be limited by the Earth’s atmosphere.
to be close to the stars.
to not be limited by the Earth’s horizon.
9. An electromagnetic wave with a wavelength of 100 nm is
microwave radiation.
UV radiation.
visible radiation.
IR radiation.
10. The angular size of the Moon is
1 800 arcminutes
1.8 degrees
18 degrees
1 800 arcseconds
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