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