What do we mean by the term inflation?
A) a sudden and extremely rapid expansion of the universe that occurred in a tiny fraction of a second during the universe's first second of existence
B) the expansion of the universe that we still observe today
C) the sudden release of photons when a particle and antiparticle annihilate one another
D) quantum fluctuations by high speed, relativistic particles in a state of false vacuum that caused disturbances in the space—time continuum leading to the process described in the question to which this answer refers
A) a sudden and extremely rapid expansion of the universe that occurred in a tiny fraction of a second during the universe's first second of existence
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When two galaxies collide, they pass through each other and their stars almost never collide
a. True b. False Indicate whether the statement is true or false
Which of these hypothetical observations (none of them are real) would force us to reconsider our modern, Sun-centered view of the solar system?
a. We discover a small planet beyond Saturn that rises in the west and sets in the east each day. b. We find that we are unable to measure any parallax for a distant galaxy. c. We discover an Earth-sized planet orbiting the Sun beyond the orbit of Pluto. d. We discover that the universe is actually contracting, not expanding.
What happens to an electron's wave packet if an accurate velocity measurement is performed?
A) It suddenly changes to a new wave packet having a very small uncertainty in position, but a large uncertainty in velocity. B) It suddenly changes to a new wave packet having a very small uncertainty in velocity, but a large uncertainty in position. C) It suddenly changes to a new wave packet having small uncertainties in both velocity and position. D) Neither the wave packet nor the electron is affected by the measurement. E) The wave packet is unaffected by the measurement, even though the electron itself makes a sudden change of state that is caused by the measurement.
Body waves can be divided into two types—primary waves and secondary waves. What is the difference between these two types of body waves?
What will be an ideal response?