The look-back time to the Sun is _____
A) 1.3 minutes
B) 8 minutes
C) 16.2 minutes
D) 20 minutes
B
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Semiconductors: A p-type semiconductor is produced by
A. doping the host crystal with donor impurities. B. doping the host crystal with acceptor impurities. C. pure crystals of germanium.
A wire of diameter 0.20 mm stretches by 0.20% when a 6.28-N force is applied to it. What is Young's modulus for this wire?
A) 2.5 × 1010 Pa B) 1.0 × 1011 Pa C) 2.5 × 1012 Pa D) 1.0 ×1012 Pa
If the period of a pendulum is tripled, then by factor is the length of the string increased?
a. 3 b. 6 c. 9 d. 1/3
What happens to the star's outer layers as the fuel in its core is used up?
A. They shrink and cool. B. They expand and heat up. C. They shrink and heat up. D. They expand and cool. E. Nothing. Only the interior changes.