ABeka Science 6-5.1 - 5.2
Terms
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- A wave consisting of an electric field and a magnetic field vibrating at right angles to each other.
- electromagnetic wave
- What is a telescope?
- It is a device to make distant objects appear clearer or closer.
- Who was Galileo?
- He an Italian who was the first astronomer to make extensive use of a telescope in his study of the heavens.
- What is a reflecting telescope?
- A telescope that uses mirrors to produce an image.
- What is reflection?
- The turning back or turning aside of any wave when it hits an obstacle.
- What is refraction?
- The bending of any wave's direction at the boundary between two wave media.
- An invisible region in which electrically charged objects may be attracted or repelled.
- electric field
- What are pulsars?
- Stars producing rapid bursts of radio waves, in some cases hundreds of times per second.
- What speed does electromatic waves travel at?
- 186,000 miles per second. (or about 670 million miles per hour.)
- Who was Sir Isaac Newton?
- The developer of the reflecting telescope.
- What is the Hubble Space telescope?
- The medium sized telescope that can "see" without any atmospheric interference and produce images of great clarity.
- A region in which certain objects are attracted or repelled by a magnet.
- Magnetic Field
- What Scottish scientist discovered electromagnetic waves in the 1800s?
- James Clerk Maxwell
- What is frequency?
- How fast the wave oscillates.
- What is a wavelength?
- the length of one complete wave or cycle of oscillation(measured from crest to crest or trough to trough).
- What is the electromagnetic spectrum?
- All the the different types of electromagnetic waves together, when arranged according to frequency and wavelength, make up this spectrum.
- What is a spectroscope?
- A device that astromoners use to split light into a spectrum for analysis.
- What is the simplest possible telescope?
- The simple combination of two convex lenses called a refracting telescope.
- What is the refracting telescope?
- A telescope that uses lenses to gather light and form an image.
- What is commonly referred to as the speed of light?
- The important number(speed) that electromatic waves travel at.
- What are radio telescopes?
- Instruments that collect radio waves from space; they allow us to study the heavens using portions of the electromagnetic specrtrum that are invisible to the human eye.