Why is the sky blue?
A) Air molecules scatter blue light more effectively than red light.
B) The gases in Earth's atmosphere emit blue light.
C) The Sun mainly emits blue light.
D) The atmosphere transmits mostly blue light.
E) Because of the way light is reflected off of the oceans.
A) Air molecules scatter blue light more effectively than red light.
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Magnifying Glass With the Image at the Near Point of the Eye: A person with a near point of 25 cm uses a magnifying lens having a focal length of 10 cm. What is the angular magnification of this lens if the person's eyes are focused at his near point?
A. 1.5 B. 2.5 C. 3.5 D. 4.5
The beginning of the Paleozoic is marked by the emergence of
A) organisms with hard parts. B) fish and fungi. C) extensive glaciated deposits. D) none of these
Which internal energy source produces heat by converting gravitational potential energy into thermal energy?
A) accretion B) differentiation C) radioactivity D) both A and B E) all of the above
A certain force is required to keep a block of wood 1 m beneath the surface of water. The force required to keep it 2 m deep is
1) zero. 2) the same. 3) twice as much. 4) four times as much. This is because 6) pressure increases with increased depth. 7) it displaces the same weight of water at any depth. 8) wood floats. 9) surface tension is not present beneath the surface.