In a compound microscope the final image is formed by the objective
Indicate whether the statement is true or false
FALSE
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That quasars were at cosmological distances yet appeared like ordinary faint stars meant
A) they were the brightest stars ever observed. B) they must be very large. C) they must contain many O and B type stars. D) they must be producing such large quantities of energy than even fusion could not explain their output. E) they must be very small, but bright due to gravitational lensing.
Which of the following is TRUE?
A) The center of the universe is located at a point about 200 Mpc from us in the center of a cluster of galaxies. B) At the time that the Big Bang expansion began, all matter and energy in our observable universe was compressed into a single point of space. C) It is possible for galaxies that are very distant to actually move through space at a speed several times the speed of light. D) A redshift occurs when a photon loses energy and slows down as it moves through space. E) We measure a redshift for roughly half of the galaxies that we observe, and for the others we measure a blueshift.
Find the magnetic energy stored in the air gap between two very large magnetic pole pieces, one North, one South, each with an area of 100 cm2 . Assume the 0.05 T magnetic field is uniform within the 2-cm gap
The fact that desert sand becomes very hot in the day and very cold at night is evidence that sand has a
A) low specific heat capacity. B) high specific heat capacity. C) none of the above