sound and space Flashcards
(20 cards)
amplitude
height of the wave from resting position
how does a sound wave travel
through vibrations of particles
what is a crest and trough?
a crest is the top of a wave graph where the line is at its highest: also known as a crest
the bottom of a wave graph where the line is at its lowest
what is subduction
the process that occurs when two tectonic plates meet at convergent boundaries, and one of the plates moves under the other one
oscilloscope
electronic equipment used to display a waveform on a screen
pitch
the highness or lowness of a note
waveform
the shape of a graph that shows how vibrations occur in a wave: usually a line with a regular up-and-down curved pattern
when the vibrations are faster what happens
the pitch becomes higher
frequency
what measured in
the number of vibrations
as frequency increases so does the pitch
the frequency is measured in hertz or Hz
interference
the effect when two or more waves meet. these waves can enforce or cancel each other out
reinforce
when two or more waves are in phase with each other they reinforce one another making the sound louder. frequency doesn’t change.
cancel out interference
if the trough of one wave and the peak of the other line up they will cancel out and become zero
collision theory
one of the theories for the formation of the moon: is sometimes called the giant impact hypothesis.
Giant Impact Hypothesis: According to this theory, a Mars-sized object collided with the early Earth around 4.5 billion years ago.
Debris Ejection: The impact was so powerful that it ejected a massive amount of debris from the Earth’s mantle into space.
Formation of the Moon: The debris formed a ring around the Earth, which eventually coalesced to form the Moon.
nebula/nebule what are they mainly made of
clouds of dust and gas in space. they are mainly made up of hydrogen and helium
northern and southern hemisphere
the sides of the equator
stealer nurseries
places in a nebula where stars are formed
how are stars made?
dust and gas are pulled together by gravity, and as the object grows gravity increases attracting more material. pressure also increases giving out light
continental costs
the outlines of the continents that form the boundary between land and sea or ocean
fossil record
the collection of remains of dead animals and plants from millions of years ago provides evidence of what conditions were like in those times
what makes tectonic plates move
The movement of these tectonic plates is likely caused by convection currents in the molten rock in Earth’s mantle below the crust
