Suppose you look by eye at a star near the edge of a dusty interstellar cloud. The star will look ________ than it would if it were outside the cloud
A) dimmer and bluer
B) more redshifted
C) brighter and redder
D) dimmer and redder
D
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Why is spectral intensity not diminished by the distance from the source of radiation?
What will be an ideal response?
What is the current dominant geological process on Mars?
a. plate tectonics b. volcanism c. wind erosion d. water erosion e. cratering
An astronaut lands on a previously unknown planet of radius 2350. km and she measures the acceleration of gravity to be 3.20 m/s2
(a) What is the mass of this new planet? (b) What does the astronaut weigh on this new planet if she weighs 384. N on Earth?
Thermal Expansion: Consider a flat steel plate with a hole through its center as shown in the figure. When the temperature of the plate is increased, the hole will
A. expand only if it takes up more than half the plate's surface area. B. contract if it takes up less than half the plate's surface area. C. always contract as the plate expands into it. D. always expand with the plate. E. remain the same size as the plate expands around it.