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 the focal length is very long.
for amateur telescopes.
when interference is used.
2. Which of the following parameters is the same for all electromagnetic waves propagating in a vacuum?
Wavelength
Colour
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 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 magnification.
improve the light spectrum.
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
a flat secondary mirror
just the primary mirror
a diverging secondary mirror
a correction plate
7. With respect to a dim light, a bright light emits
photons with shorter wavelength.
photons with higher amplitude.
photons with longer wavelength.
more photons.
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 improve the magnification.
to not be limited by the Earth’s horizon.
9. An electromagnetic wave with a wavelength of 100 nm is
UV radiation.
IR radiation.
visible 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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