Exploring the Cosmos - Degree Exam 2011 - Mapping the Universe
1. Which of the following is a true statement?
Light is a particle, but not a wave.
Light is a wave, but not a particle.
Light is both a wave and a particle.
Light is neither a wave nor a particle.
2. Which of the following describes waves whose wavelength is approximately 1 mm?
X-Rays.
Microwaves.
Radio waves.
Visible red light.
3. What is the phenomenon where the velocity of light in a medium depends on its wavelength?
Refraction
Dispersion
Diffraction
Interference
4. Newton's telescope was a
reflecting telescope.
Cassegrain telescope.
refracting telescope.
prime focus telescope.
5. Modern telescopes use CCDs to capture the light. What does the acronym CCD stand for?
Charge Collecting Diode.
Charge Coupled Diode.
Count Collecting Device.
Charge Coupled Device.
6. Ultra-Violet (UV) radiation is emitted by objects of temperature around
10 K
500 K
1 000 000 K
10,000 K
7. The Chandra Observatory is an observatory for
X-Ray astronomy.
Radio astronomy.
Infra-red astronomy.
Neutrino astronomy.
8. Why can X-Rays penetrate inside solids?
They are very non-reactive.
They are of very small frequency.
They are out of phase with ordinary matter.
They have very small wavelengths.
9. Why are neutrinos so hard to detect in astronomical observatories?
The neutrinos decay before reaching the Earth.
Neutrinos are absorbed in the upper atmosphere.
There are no astronomical sources of neutrinos.
The neutrinos interact only weakly.
10. Which of the following is NOT a good source of gravitational waves?
Pulsars.
Supernova explosions.
Magellanic clouds.
Black Hole binary systems.
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