| A | B |
|---|
| color with the shortest wavelength | violet |
| color that is most difficult to deflect | red |
| color with the lowest frequency | red |
| Why is the ocean blue? | blue scatters more light; water absorbs other wavelengths;other colors are not scattered as much |
| What color would the sky be without an atmosphere? | black |
| What 2 forces need to be balanced to keep a satellite in orbit? | gravity and velocity |
| What types of radiant energy are produced by stars? | visible light, radio waves, x-rays, ultraviolet, and infrared |
| What does a spectrascope reveal about a star? | the chemical make up of a star |
| What is the earliest telescope that was used by Galileo? | refracting optical telescope |
| Best location for an optical telescope? | mt. peaks in dry climates (thinner air), and remote areas |
| 4 reasons telescopes are kept in domes | 1)protection from weather 2)prevention of glass or mirror expanding or contracting in temperature changes 3)air turbulence causes blurry images 4)keeps temperture regulatedd toward nighttime temperature |
| How many lenses does a refracting telescope have? | 2- The objective lens and eye piece |
| Why arent refracters NOT built today? | 1) mirrors don't need to be pure & perfect 2)mirrors are only ground on 1 side 3)There is no sag or image blur with a mirror because it can be supported across the entire back |
| MMT | multiple mirror telescope |
| Observatories (DEF) | building that houses professional telescopes |
| Example of radio telescope | VLA in Socorro, New Mexico composed of a # of telescopes linked together |
| ROY G BIV | red orange yellow green blue indigo violet |
| When the radius of a lens is doubled the light gathering power increases ___ times. | 4 times |
| synonym for array | group |
| distance between two radio telescopes | baseline |
| twice the amplitude | waveheight |
| # of crests passing by a spot in a set amount of time | frequency |
| Over what part of the Earth must a TV satellite be placed, for the best continuous reception? | equator |
| single mirror reflecting telescope | Has an eyepiece & uses a large mirror as an objective (light collected hits a cocave mirror) |
| launched in 1990 by the Shuttle Discovery | Hubble Space telescope |
| radio telescope arrays | groups of radio telescopes working together to combine signals for greater strength |
| interferometry (DEF) | the use of two radio telescopes to detect a radio signal from the same pt. in space & determine the signals location |
| speed of all electromagnetic waves | 300,000 km/sec |
| location of largest single dish radio telescope | Puerto Rico |
| Original problem with the Hubble Space Telescope | One of its lens or mirrors was not shaped correctly and caused blurry images. Fixed with a correcting lens. |
| Sources of dark-line spectra | Stars & the atmosphere of planets |
| Sources of Continuous Spectra | Visible light from the sun, regular Tungsten light bulbs |
| Sources of Bright-line Spectra | Neon signs, LED |
| 3 types of spectra | Bright-line, Dark-line, Continuous |
| Synonym for Bright-line Spectra | Emission Spectra |
| Synonym for Dark-line Spectra | Absorption Spectra |
| Crest (Def) | Highest part of a wave |
| Trough (Def) | Lowest part of a wave |
| Wavelength (Def) | Distance from one crest to the next or one trough to the next |
| Amplitude is a measure of the amount of ________ a wave has. | Energy |
| Types of Electromagnetic Energy in order from the largest wavelength to the shortest | Radio waves, Microwaves, Infrared waves, Visible light (Red, Orange, Yellow, Green, Blue, Indigo, Violet) Ultraviolet, X-rays, Gamma rays |
| Type of electromagnetic energy that has the shortest wave length | Gamma rays |
| Type of electromagnetic energy that has the longest wave length | Radio waves |
| Type of electromagnetic energy that has the highest frequency | Gamma rays |
| Type of electromagnetic energy that has the lowest frequency | Radio waves |
| 2 Advantages of radio telescopes | Can be used day or night and are not effected by bad weather |
| Type of wave a sound wave is. | Longitudinal |
| Type of wave light is. | Transverse |
| Doppler Effect (def) | Concept in which a wave is compressed as the object comes closer & the wave expands as the object moves away from the observer. |
| Red Shift | If a star is moving away from the observer, the stars spectrum (fingerprint) shifts towards the red end of the spectrum |
| Blue Shift | If a star is moving toward the observer, the stars spectrum (fingerprint) shifts towards the blue end of the spectrum |
| Formula for velocity of a wave | Wavelength times Frequency. |
