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OCR A-Level Physics A Astronomy & Cosmology Flashcards | StudBud
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OCR A-Level Physics A Astronomy & Cosmology
What is meant by the Big Bang?
What is 1 Au?
OCR A-Level Physics A Astronomy & Cosmology
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1
What is 1 Au?
10% of 1 ly.
Gold
The distance from the Earth to the Moon.
The distance from the Earth to the Sun.
2
What is meant by the Big Bang?
That rubbish American TV programme.
The Earth was formed in a Big Bang.
The theory that the Universe began as a singularity 13.7 billion years ago.
The Universe will end in a Big Bang.
3
What determines the energy of a photon emitted by an atom?
The size of the gap between atomic energy levels.
The number of slits in a diffraction grating.
The number of photons the atom absorbs.
The colour of the atom.
4
What word describes the following: "The universe looks & behaves the same in all directions - it has no edge."
Homogeneous
Constant
Isotropic
Cosmological principle
5
What observations did Hubble make about distant galaxies?
Most galaxies are blue-shifted, and further ones are blue-shifted more.
Most galaxies are red-shifted, and further ones are red-shifted more.
The closest galaxies are moving quickest.
Space is expanding.
6
How can you estimate the age of the Universe?
H0 x v
v/H0
1/H0
7
Parallax can be used to measure the distance to any star.
False
True
8
What does the homogeneity of the Universe mean?
The laws of Physics always apply.
Matter is distributed evenly and the universe has roughly constant density.
The Universe has always been the same.
The Cosmological Principle is always correct.
9
In a diffraction grating experiment, short wavelengths will diffract by a larger angle.
False
True
10
Blue-shift is caused by galaxies moving away from Earth.
True
False
11
What is p in the equation d = 1/p?
Parallax angle in arcsec.
Parallax angle in degrees.
Parallax distance in parsec.
Parallax distance in m.
