Star A has twice the parallax as Star B. Star A is
A)
twice as far as Star B.
B)
four times as far as Star B.
C)
eight times as far as Star B.
D)
half as far as Star B.
E)
one fourth as far as Star B.
D
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Ideal Gas Law: A laboratory vacuum pump can reduce the pressure in a chamber to 1.0 × 10-7 Pa. If the volume of the chamber is 0.500 m3 and the temperature is 27°C, how many molecules are left inside the chamber? (NA = 6.022 × 1023 molecules/mol, R = 8.31 J/mol ? K)
A. 1.2 × 1013 B. 2.4 × 1013 C. 1.2 × 1012 D. 2.4 × 1012 E. 1.2 × 1014
Wave Characteristics: In an electromagnetic wave in free space, the electric and magnetic fields are
A. parallel to one another and perpendicular to the direction of wave propagation. B. parallel to one another and parallel to the direction of wave propagation. C. perpendicular to one another and perpendicular to the direction of wave propagation. D. perpendicular to one another and parallel to the direction of wave propagation.
About how hot is the core of Earth?
A. 15 million K B. 6,500 K C. 300 K D. 15,000 K
Your vision is sharpest when your pupil is
A) dilated. B) constricted. C) same either way