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 the diameter of the prime mirror is very large.
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
Amplitude
Colour
Speed
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 travelled by the wave in 1 second.
The wavelength is the distance between two consecutive peaks.
4. Interference between the light coming from different telescopes is used to
improve the light gathering.
improve the magnification.
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 speed of light changes.
Because the frequency increases.
Because the amplitude is reduced.
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 shorter wavelength.
photons with longer wavelength.
photons with higher amplitude.
more photons.
8. The Hubble telescope was placed in space in order
to improve the magnification.
to not be limited by the Earth’s horizon.
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
microwave radiation.
UV radiation.
IR radiation.
visible radiation.
10. The angular size of the Moon is
1 800 arcseconds
1.8 degrees
18 degrees
1 800 arcminutes
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