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physical science test 5

Terms in this set (46)

In a transverse wave, the individual particles of the medium move ______ to the direction of travel.
perpendicular
An example of a purely ______ wave is a sound wave.
longitudinal
The "big bang" refers to the origin of the _____
universe
Information about the origin of the ______ does not come from the fact that spiral galaxies rotate.
universe
in a "closed" universe expansion will stop and the universe will ultimately ______
collapse
the doppler shifting of radiation from the early universe has resulted in today's universe being bathed in a sea of _______
radio waves
immediately after the _____ ______ the universe contained slightly more matter than antimatter.
big bang
the heavy elements in the earth were formed in ____ ____ explosions.
super nova
communications with planets outside the solar system are most likely to be achieved using ____ waves
radio
an example of a wave that is partly _____ and partly transverse is a water wave.
longitudinal
when waves go from one place to another, they carry _____
energy
the amplitude of a sound wave determines its
loudness
sound waves travel faster in
solids
the higher the frequency of a wave, ____ ____ its wavelength
the shorter
ultrasound refers to the sound whose ______ is too high for most people to hear.
frequency
protons and electrons have equal masses. True or false?
false
aotms and molecules are normally electrically ______
neutral
the ______ of an atom contains the most of the atom's mass.
nucleus
the _____ is the unit of electric potential difference.
volt
the watt, the unit of _____ is equal to the volt ampere.
watt
when a current passes through a resistance, the electric energy that is lost becomes ____
heat
a _______ attracts some substances and repels others.
magnet
a magnet does not exert a force on a stationary electric charge. True or false?
true
the current with which a transformer is used must be
ac
most of the mass in the solar system is located in
the sun
is Jupiter an inner planet?
no
compared to the inner planets, the outer planets are denser rotate more ______ on their axes.
rapidly
comets consist largely of _____ and _____
ice and dust
the tail of a comet always points away from the sun. true or false?
true
the Oort Cloud, which lies outside the orbit of Neptune, consists mainly of _____
comets
the planet with the shortest year is
mercury
the planet with the longest day is
Venus
of the following planets, the one with the most satellites is
Jupiter
The asteroids are probably similar in composition to stony
meteorites
the great red spot is an atmospheric disturbance occurring on the planet
Jupiter
a planet that consists largely of gasses is Neptune.
True
an eclipse of the ___ can only occur when the moon passes directly between the earth and the sun.
sun
if the moon were smaller than it is, total eclipses of the sun would never occur.
true
the temperature of a star directly affects its color.
true
bc of the spectra of most stars consist of dark lines on a bright background, these stars must have ___ interiors surrounded by ____ atmospheres
hot, cool
the sun has an atmosphere that extends well out into the solar system.
true
the two chief elements in the sun are hydrogen and ___
helium
the source of the sun's energy is nuclear
fusion
the duration of the sunspot cycle is about ___
11 years
the distance of a star from the earth can be found by comparing its luminosity and ___
brightness
the color of a relatively hot star is
blue
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