Physics SL – Astrophysics Luminosity/Spectral classes

Luminosity of a star A representation of its power output i.e. its “true brightness” Intensity/Flux of a star How bright it appears to be i.e. its “apparent brightness” How is the intensity/flux of a star measured? By ground based telescopes Distance to a star using luminosity and flux D = √(L/4πF), where D is distance […]

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Astrophysics PART 4

Newton’s Model of the Universe The universe is infinite in both space and time. It is uniform and static. Meaning there are an infinite number of stars heading out in all directions to infinity (otherwise the universe would collapse under its own gravitational force) Obler’s Paradox Question Why is the night sky dark? or Why […]

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Physics – Topic D: Astrophysics – D.1 Stellar Quantities

Comets Comets are irregular objects a few kilometres across comprising of frozen gases, rock and dust. Stars (Single & Binary) All stars initially form when gravity causes gas in a nebula to condense. As the atoms move towards one another, they lose gravitational potential energy that is converted into kinetic energy. This raises the temperature […]

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Frosci midterm (Brain and Behavior + Astrophysics)

neuron cells – nerve cells – carry electrical pulses that transfer from 1 neuron to another – over 100 billion in brain – 3 parts: 1. cell body (grey matter) 2. dendrites (grey matter) 3. axons (white coated in myelin) signals picked up by dendrites –> cell body –> action potentials (electrical charge) –> axon […]

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Astrophysics Basic Terms

singularity point of infinite mass and infinite density in an infinitely small space, usually in a black hole light year 9.46073047 x 10^15 meters planet An astronomical object orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has […]

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IB Physics Option D Astrophysics

Asteroid Small rocky body that drifts around the solar system Meteoroid Asteroid on a collision course with another planet Comets Mixtures of rocks and ice in very elliptical orbits around the Sun Nebula Cloud of gas and dust where stars begin to form Binary stars Two or more stars orbiting around their common centre of […]

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Chapter 5 AstroPhysics

Refracting telescopes are so called for which of the following reasons? The light is bent to a focus. Which of the following is the first thing light hits when it enters a telescope? the primary lens or mirror In a telescope, which of the following is the optical element with the shortest focal length? the […]

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Astrophysics and Communications Principles

Apparent brightness The amount of energy per second received per unit area Luminosity The total amount of energy emitted by the star per second Asteroid Rocky object ranging in size from dust particle to several 100 kilometers in radius Asteroid belt Asteroids found collectively between Mars and Jupiter Comets Mixtures of rock and ice in […]

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Astrophysics Quiz 2

How do you calculate Magnitude? focal length of scope/focal length of eye piece List the electro-magnetic spectrum from longest to short radio, microwaves, infrared, visible, ultraviolet, xray, gamma What are the four colors stars can be and what is their order? red, yellow, white, blue What is the wavelength of the visible spectrum? 700 nm […]

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IB Option E: Astrophysics: Stellar radiation and stellar types

Fusion the main energy source of stars How stars are formed Stars are formed by interstellar dust coming together through mutual gravitational attraction. Loss in potential energy as this happens can (if the initial mass of the dust collection is sufficient) produce high temperatures necessary for fusion. The fusion process produces a radiation pressure that […]

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IB Physics Topic Option E Astrophysics

Define a planet. •Celestial body that orbits around the sun •has sufficient mass for its self gravity •has cleared the neighborhood around its orbit Define astroids. Between orbits of Mars and Jupiter, smaller orbiting bodies Define comets. •small orbiting body •loose particles of ice and rock that are blown off by the solar wind forming […]

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Astrophysics IB PHYSICS HL

Solar system Mercury, venus, earth, mars, jupiter, saturn, uranus and neptune. Stellar clusters Groupings of a large number of stars bound by gravity. 1. Globular clusters: large number of mainly old stars. 2. Open clusters: small number of young stars that are farther apart. Galaxy A huge assembly of stars bound together by gravity. Cluster […]

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Glossary (Nuclear, Thermal and Astrophysics) AQA Physics A Unit 5A

Absolute magnitude (M) The apparent magnitude a star would have if it were placed at a standard distance of 10 pc from Earth. m – M = 5 log(d/10) where d is the distance in parsecs. Activity (A) The number of emissions per second, measured in Becquerels. Airy disc The bright central region in an […]

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Option D: Astrophysics

Binary star Two stars orbiting a common centre Black dwarf The remnant of a white dwarf after it has cooled down. It has very low luminosity. Black hole A singularity in space time; the end result of the evolution of a very massive star Brown dwarf Gas and dust that did not reach high enough […]

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Sun 99% of the mass of the solar system made mostly of H/He gas (plasma) converts 4 million tons Mercury Made out of metal and rock, large iron core cratered, desolate, long, tall, steep cliffs Venus Earth’s twin because size surface hidden by clouds 1 day Venus 243 days earth hellish conditions due to an […]

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AQA Physics Astrophysics

Convex lens A lens that causes light to be focused towards a point, an image formed is real, inverted Concave lens A lens that causes light to spread out, an image formed is vertual and diminished Focal point The point at which several light rays converge Magnifying power The ratio of the objective lens focal […]

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astrophysics study guide

chapter 12 … what dust is emitted into to create galaxies interstellar medium giant molecular clouds which are cool and dense collapse into cluster of stars if temp reaches 10,000,000K what happens nuclear fusion into a protostar high mass stars have higher luminosity than low mass stars (t or f) true chapter 13 read full […]

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astrophysics test 3

Milky way diameter 100,000 LY how many stars in milky way 100-400 billlion stars different naming of milky way greeks galaxies kuklos (milky circle) then romans named: via lactea (milky way) distances by cepheid variable stars henrietta leavitt 1912 vary in luminosity/time determining size by open star clusters and globular clusters open star clusters- location […]

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Astrophysics Topic 2- Classification of stars

Apparent magnitude brightness which depends on the intensity of light received Luminosity total amount of energy emitted per second Intensity power received per unit area Parsec distance to a star which subtends an angles of 1 arc second to the line from the centre of the Earth to the centre of the Sun Absolute magnitude […]

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OCR Physics A Astrophysics and Medical Physics Definitions

planet Orbits a star and has sufficient mass that its own gravity gives it a round shape. It has no fusion and it has cleared its orbit of most other objects. planetary satellite A body in orbit around a planet (includes moons and artificial satellites). main sequence The main period in a stars life when […]

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Physics: Astrophysics Vocabulary Definitions

Light year The distance travelled by light in one year. Luminosity The amount of energy radiated by a star per second. Apparent brightness The received energy per second per unit area of a detector (on earth). Parsec The distance to a star whose parallax is one arcsecond. Apparent magnitude A measure of how bright an […]

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