which planet did Galileo observe with his telescope?
jupiter
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which model of the solar system did Galileo observations provide evidence for ?
heliocentric model
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what was the first model of the solar system ?
geocentric model
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what is the purpose of the eyepiece of a simple telescope ?
magnifies
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what is the name of the lens in a telescope that produces the image ?
objective lens
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what do waves not transfer ?
matter
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what do waves transfer ?
energy and information
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which scientists contributed to the discovery of waves outside the limits of the visible spectrum ?
Herschel and Ritter
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what type of waves are all electromagnetic ?
transverse
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all electromagnetic waves travel at the same speed in what ?
Vacuum
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write the electromagnetic spectrum in order
radio, microwaves, infra-red, visible, ultraviolet, x ray, gamma
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which electromagnetic waves are the most dangerous ?
highest or lowest frequency
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what is the danger to the body of microwaves ?
internal heating of body cells.
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what is the danger to the body of infra red ?
skin burns.
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which parts of the body do ultraviolet waves damage ?
surface cells and eyes.
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what is the danger of x rays and gamma rays ?
mutation or damage to cells in the body.
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list some uses of radio waves ?
broadcasting, communications and satellite transmission.
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list some uses of microwaves ?
cooking, communication and satellite.
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list some uses of infra-red ?
cooking, thermal imaging, short range communications, optical fibres, television remote controls and security systems.
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list some uses to visible light ?
vision , photography and illumination.
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how is ultraviolet used ensure the health of people ?
disinfecting water.
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how can we use x rays ?
observing the internal structure of object, airport security scanners and medical x rays.
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what can gamma rays sterilise ?
food and medical equipment.
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what do radioactive sources emit all of the time ?
ionising radiations.
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what two types of particles are ionising radiations ?
alpha and beta
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which galaxy is our solar system part of ?
Milky way.
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what is a galaxy ?
collection of stars.
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what methods are used to gather evidence for life beyond earth ?
space probes, soil experiments by landers.
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what does SETI stand for ?
search for extraterrestrial intelligence.
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how modern telescopes improved our understanding of the universe ?
the observation of galaxies because of improved magnification.The discovery of objects not detectable using visible light.The ability to collect more data.
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what is a simple spectrometer used for ?
analyse light sources.
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list the evolution of stars of similar mass to the sun
nebula, star(main sequence) , red giant, white dwarf.
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Other cards in this set
Card 2
Front
which model of the solar system did Galileo observations provide evidence for ?
Back
heliocentric model
Card 3
Front
what was the first model of the solar system ?
Back
Card 4
Front
what is the purpose of the eyepiece of a simple telescope ?
Back
Card 5
Front
what is the name of the lens in a telescope that produces the image ?
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