Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
22 Cards in this Set
- Front
- Back
|
Which electromagnetic waves has the most energy? ultraviolet, radio waves, visible light, or infrared |
ultraviolet |
|
|
What is a tiny bundle of electromagnetic energy called? CCD, gamma ray, photon, electron |
photon |
|
|
Who was the first person to realize that mirrors could be used to construct a telescope? |
Isaac Newton |
|
|
T/F: All types of electromagnetic waves travel at the same speed in a vacuum |
True |
|
|
The distance from the earth to the Sun has been called? |
the astronomical unit |
|
|
T/F: Light leaving the earth would take a little more than one second to reach the Moon, 400,000 km away. |
True Light travels at 300,000 km/s. Light would travel 300,000 km in one second and would then be only 100,000 km away from the Moon. It would take less than half a second to cover the rest of the distance. So light would take a little more than one second to reach the Moon, 400,000 km away. |
|
|
T/F: The amount of light collected by a telescope is proportional to the area of its aperture |
True The amount of light collected is proportional to the area of the telescope’s opening (sometimes called aperture 1) |
|
|
T/F: The number of times you will orbit the Sun in your lifetime will be the same as the number of days in your life |
False As a “passenger” on Earth, you orbit the Sun in the same amount of time that Earth does. It takes one year for Earth to orbit the Sun, so the number of times you orbit the Sun in your lifetime will be equal to the number of years in your life, not the number of days in your life. |
|
|
On March 21 the Sun is directly above which location? |
the Equator |
|
|
How fast do radio waves travel? |
300,000 km/s |
|
|
What is the best way to obtain astronomical data? |
use a telescope in space |
|
|
T/F: The Hubble Space Telescope gives us much better images than Earth-based telescopes because it is much larger than Earth-based telescopes. |
False The Hubble Space Telescope gives better images because the light reaching it does not have to travel through Earth’s atmosphere. |
|
|
What causes the earth to have seasons? |
The tilt of Earth’s axis allows direct sunlight to hit different places throughout the year. |
|
|
Two types of telescopes are: refracting and reflecting reflecting and differential Newtonian and Galilean chromatic and aberration air and glass |
refracting and reflecting |
|
|
What is chromatic aberration? |
the distortion of colors that occurs as light passes through a lens. |
|
|
T/F: The biggest telescopes in use today are refracting telescopes |
False Refracting telescopes are those that use lenses to focus light. Larger lenses are very difficult to make and are very fragile. The biggest telescopes are actually reflecting telescopes. Reflecting telescopes use curved mirrors to focus light. |
|
|
The apparent daily motion of the Sun, Moon, and stars from east to west is caused by? |
the Earth’s rotation |
|
|
T/F: Reflecting telescopes often suffer from spherical aberration |
True Spherical aberration refers to the fact that a spherically polished mirror does not bring all light to a sharp focus. This only occurs in reflecting telescopes. |
|
Constellation? Andromeda Ursa Major Lyra Cygnus Ursa Minor |
Ursa Minor |
|
Constellation? Ursa Major Cygnus Aquila Lyra Cepheus |
Cygnus |
|
Bright Star? Algol Polaris Deneb Vega Altair |
Deneb |
|
|
Match Bright Stars with their Constellations: Stars: Polaris, Vega, Deneb, Algol, Altair Constellations: Perseus, Cygnus, Aquila, Lyra, Ursa Minor |
Polaris = Ursa Minor Vega = Lyra Deneb = Cygnus Algol = Perseus Altair = Aquila |
