1. angular resolution ability to distinguish between two adjacent objects in the sky
Post on 28-Dec-2015
218 Views
Preview:
TRANSCRIPT
2. Cassegrain telescope -
• reflector telescope where light is reflected back through a hole in the center of the curved mirror
3. charge-coupled device (CCD) -
• electronic device that detects amount of light hitting different pixels
6. focal length -
• distance from edge of mirror or center of lens to the point of the focus of light rays.
8. Newtonian telescope -
• reflector where light is reflected to the side near the top of the telescope
9. prime focus -
• reflector telescope where the image is viewed at the point of focus of the main reflector
1. How does a refracting telescope focus light?
• A refracting telescope uses a lens to bend light and focus it at a point.
How does a reflecting telescope focus light?
• A reflecting telescope uses a curved mirror to focus light at a point.
Reflectors are used for four basic reasons:• (1) Lenses suffer from chromatic
aberration.
• (2) Lenses are opaque to IR and UV radiation.
• (3) Large lenses are heavy, mirrors can be supported across the back surface.
• (4) A lens has two surfaces that need to be polished.
3. What advantages does the Hubble Space Telescope have over ground based telescopes?
• No atmospheric blurring.
4. Why do radio telescopes have to be extremely large?
• The radio waves to be reflected are extremely long.
6. convection
• Circulation of fluids caused by differences in density due to differences in temperature.
8. crust -
• Thin surface of the Earth; mostly made of granite on the continents, basalt under the oceans.
10. differentiation
• Separation of materials of the Earth by density; most dense in core, least dense on surface.
11. dynamo theory -
• Convection currents in the outer core combined with the rotation of the Earth produces the Earth’s magnetic field.
14. greenhouse effect
• The atmosphere of the Earth traps much of the heat re-emitted by the surface.
22. neap tide -
• Lower than normal tides caused by the Sun’s gravity pulling at right angles to the Moon.
24. ozone layer -
• Atmospheric layer where UV radiation is absorbed by oxygen, ozone, and nitrogen.
• (20 - 50 km)
27. spring tides -
• Higher than normal tides caused when the Sun’s gravitational pull is added to the Moon’s because all three are in line.
33. Van Allen belts -
• Two donut-shaped regions of magnetically trapped charged particles high above atmosphere.
1. By comparison with Earth’s average density, what do the densities of water and rocks in Earth’s crust tell us about Earth’s interior?
• Earth’s average density is 6 g/cm3. Water and crust are 1 g/cm3 and 3 g/cm3. Therefore, inner Earth must be greater than 6 g/cm3.
2. Give a brief description of the magnetosphere, and tell how it was discovered.• Area that is affected by the magnetic field
of the Earth, trapping charged particles produced by the solar winds.
• Discovered by satellites launched in the late 1950’s.
3. What process has created the surface mountains, oceanic trenches, and other large-scale features on Earth’s surface?
• Plate tectonics.
top related