The overall dimming of starlight by interstellar matter is called:
A) extinction.
B) reddening.
C) absorption.
D) emission.
E) scattering.
A
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On a Hertzsprung-Russell diagram, where would we find white dwarfs?
A) upper right B) lower right C) upper left D) lower left
Which of the following represents the maximum value of the magnetic field at a distance of 2.5 m from a 100 W light bulb?
A) 0.10 ?T B) 0.40 ?T C) 0.50 ?T D) 0.60 ?T E) 0.80 ?T
The air temperature where the humidity reaches the saturation density is called the ___________
Fill in the blank(s) with correct word
A meniscus lens is made with the radius of curvature of the convex surface being 25.0 cm and the concave surface 45.0 cm. If the glass used has index of refraction 1.50, what is the focal length of this lens?
A) -32 cm B) 32 cm C) 113 cm D) 67.5 cm E) -113 cm