IB Physics SL Option D: Astrophysics NEWEST 2024 WITH COMPLETE QUESTIONS AND CORRECT
VERIFIED ANSWERS (DETAILED ANSWERS) ALREADY GRADED A+ 100% GUARANTEED TO PASS
CONCEPTS!!!
Asteroid - ✔✔ANSW✔✔..Small rocky object orbiting the sun
Comet - ✔✔ANSW✔✔..Irregular object a few kilometers in diameter, made from frozen
gas, rock and dust. They have very elliptical orbits around the sun with varying periods,
when near the sun the gases vaporize making the recognizable "shooting star" tail
Supernova - ✔✔ANSW✔✔..A star that suddenly increases greatly in brightness
because of a catastrophic explosion that ejects most of its mass
Neutron star - ✔✔ANSW✔✔..Post-supernova remnants of some larger mass stars.
Gravitational pressure has forced a total collapse and the madd of a neutron star is not
composed of atoms but neutrons. Density is enormous. Rotating ones are called
pulsars.
Black hole - ✔✔ANSW✔✔..Post-supernova remnant of larger mass stars. Escape
velocity of a black hole is faster than the speed of light.
Cepheid variables - ✔✔ANSW✔✔..Have a regular variation in brightness and luminosity
due to an oscillation (contractions and compression) in the size of a star. There is a link
between the period of the brightness variation and their average luminosity so they can
be used to calculate the distance to some galaxies (act as "standard candles"
Binary stars - ✔✔ANSW✔✔..Two or more stars in orbit around their common centre of
mass
Wein's law - ✔✔ANSW✔✔..Wien's displacement law states that the black body
radiation curve for different temperatures peaks at a wavelength inversely proportional
to the temperature.
Hubble's law - ✔✔ANSW✔✔..The distant galaxies we see in all directions are moving
away from the Earth, as evidenced by their red shifts. Hubble's law describes this
expansion.
Meteor - ✔✔ANSW✔✔..An asteroid on a collision course with another planet
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