Exploring the Cosmos - Degree Exam 2007 - Mapping the Universe
1. A prime focus telescope represents a feasible optical configuration
when interference is used.
when the focal length is very long.
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?
Colour
Speed
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 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.
4. Interference between the light coming from different telescopes is used to
improve the resolution.
improve the light spectrum.
improve the light gathering.
improve the magnification.
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 it interferes with the surface.
Because the amplitude is reduced.
Because the frequency increases.
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 higher amplitude.
more photons.
photons with shorter wavelength.
photons with longer wavelength.
8. The Hubble telescope was placed in space in order
to not be limited by the Earth’s horizon.
to not be limited by the Earth’s atmosphere.
to improve the magnification.
to be close to the stars.
9. An electromagnetic wave with a wavelength of 100 nm is
IR radiation.
UV radiation.
microwave radiation.
visible radiation.
10. The angular size of the Moon is
1.8 degrees
1 800 arcseconds
18 degrees
1 800 arcminutes
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