Exam One Flashcards
What are the coordinates we use for the local sky
Altitude and Azimuth
How does the sun rise
East to West, due North in summer and due South in Winter
What is our cosmic address
Milky Way, Earth
What is Emission
A thin, low-density cloud of gas that emits light only at specific wavelength that depends on composition and temperature
What is Absorption
A cloud of gas between us and a light bulb that can absorb light of specific wavelengths, leaving dark absorption lines
What is Angular Size
How we measure the sky and we estimate with our outstretched hands
What speed does light travel
Light travels at a finite speed of 300,000 km/s
How do the stars rise and set
The Earth rotates West to East, so the stars rise in the East and set and the West
What is the Doppler Shift
Light emitted from an object moving towards you will have it’s wavelength shortened
How do Astronomers use the Doppler Shift
Astronomers use the Doppler Shift to tell what part of an object’s motion is moving towards or away from us
What is the REDSHIFT
Light emitted from an object moving perpendicular to your line of sight
What is BLUESHIFT
Light emitted from an object moving away from you
Types of Energy
Kinetic, Radiative, Stored, Potential, Total, Thermal, Concentrated, Orbital, Photon, Gravitational
What is a Light Year
The distance a light can travel in one year (6 trillion miles)
Types of Spectra
Emission, Continuous, Absorption
How do Astronomers use Spectra
To tell which kinds of atoms present
What is Accelerated Motion
A point or an object moving in a straight line is accelerated if it speeds up or slows down
What is the relationship between Temperature and Color
The hotter the temperatures, the more red/white an object becomes. (Red=Hot, Bright Red= Hotter, White/Glowing= Hottest)
What is the difference between the Heliocentric Model and the Geocentric Model
Heliocentric=Sun at the center
Geocentric=Earth at the center
What does an Astronomical Unit (AU) represent
The average distances from the Earth to the Sun
Types of Forces
Gravity, Normal Force, Electricity, Nuclear, Spring, Tension, Magnetic, Contact, Drag, Friction, Electromagnetism, Air Resistance, Centripetal, Electrostatics
Types of Electromagnetic Spectrums
Radio Waves, Microwaves, Infrared, Visible Light, Ultraviolet, X-Rays, Gamma Rays
Types of Orbits
Geostationary, Geosynchronous, Geocentric, Geostationary Transfer, Geosynchronous Earth, Earth, Medium Earth, High Earth, Low Earth, Polar, Near-Equatorial, Sun-Synchronous, Elliptic, Inclined, Circular, Horseshoe, Graveyard
The Longer the Wavelength
The Less Energy It Has
What Causes the Seasons
The seasons are caused by the earth’s spin on it’s axis, along with the sun hitting more or less directly on certain areas of the globe
Basics of the Telescope
Refracting, Reflecting, Catadioptric
What are Kepler Laws of Planetary Motion
1)Orbit of each planet around the sun is an ellipse
2)As a planet moves, it sweeps out equal areas at equal times
3)Planets travel faster the closer they are to the sun and slower the further they are from the sun
Conservation Laws
Energy, Mass, Linear, Angular, Electric, Momentum
What is Earths axis
23.5 Degrees
Order of the Rainbow
Red, Orange, Yellow, Green, Blue, Indigo, Violet
Red Wavelength
620-750nm
Orange Wavelength
590-620nm
Yellow Wavelength
570-590nm
Green Wavelength
495-570nm
Blue Wavelength
450-495nm
Indigo Wavelength
425-450nm
Violet Wavelength
380nm
Red Energy
1.91eV
Orange Energy
2.06eV
Yellow Energy
2.14eV
Green Energy
2.25eV
Blue Energy
2.75eV
Violet Energy
3.10eV
ROYGBIV
Red Orange Yellow Green Blue Indigo Violet
