Protostars shine brightest in
A. radio waves.
B. visible spectrum.
C. X-ray.
D. infrared spectrum.
Answer: D
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Compared with our Sun, most stars in the halo are
A) young, red, and dim and have fewer heavy elements. B) young, blue, and bright and have much more heavy element material. C) old, red, and dim and have fewer heavy elements. D) old, red, and dim and have much more heavy element material. E) old, red, and bright and have fewer heavy elements.
What power lens is needed to correct for nearsightedness where the uncorrected far point is 75 cm?
A) -1.33 D B) +1.33 D C) -0.75 D D) +0.75 D E) -1.00 D
A surface is coated with a material having index of refraction 1.41 . If light in air has a wavelength of 701 nm and is normally incident on this surface, and it is found through interference effects with this light that the surface is 11 wavelengths thick, which of the following is the thickness of the surface?
a. 4.5E–8 m b. 5.5E–6 m c. 2.7E–6 m d. 1.4E–6 m e. 2.1E–5 m
The velocity vector in a particular flow field is given by V = 2x^2yi ? 4y^2xj m/s. The acceleration at (1, ?1) is:
