Polarization is a property of
A) transverse waves.
B) longitudinal waves.
C) both of these
D) neither of these
Answer: A
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What is the purpose of a "star shade" in efforts to directly detect extrasolar planets?
A) The star shade blocks light from the central star, so planets can be seen. B) The star shade cools the star, so it does not emit so much contaminating light. C) The star shade keeps the telescope cooler, so it does not emit as much infrared light. D) The star shade changes the wavelength of starlight, so it is easier to distinguish from planet light. E) The star shade separates starlight from planet light based on temperature.
A 1.6-kg block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 190 N/m
The block is pulled from its equilibrium position at x = 0.00 m to a displacement x = +0.080 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. What is the velocity of the block at time t = 0.40 s? A) 0.82 m/s B) -0.82 m/s C) 0.30 m/s D) -0.30 m/s E) 0.00 m/s
What are the appropriate units for the Sun's luminosity?
A) Kilograms B) Joules C) Watts D) Newtons
Which of the following is not a characteristic of the outer planets?
A) They all have rings. B) They all have large quantities of gas. C) They have very few, if any, satellites. D) They are primarily made of hydrogen and helium. E) Their orbits are separated by relatively large distances.