Gravitational lensing occurs when
A) massive objects bend light beams that are passing nearby.
B) massive objects cause more distant objects to appear much larger than they should and we can observe the distant objects with better resolution.
C) dark matter builds up in a particular region of space, leading to a very dense region and an extremely high mass-to-light ratio.
D) telescope lenses are distorted by gravity.
A
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Semiconductors: An n-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.
Your lungs hold 4.2 L of air at a temperature of 27°C and a pressure of 101.3 kPa. How many moles of air do your lungs hold?
A) 0.15 moles B) 0.17 moles C) 0.19 moles D) 0.21 moles E) 0.23 moles
A copper ball with a diameter of 5.00 cm is subjected to a pressure of 
The bulk modulus for copper is 
What is the change in the volume?
A. 
B. 
C. 
D. 
E. 
A car is being towed at constant velocity on a horizontal road using a horizontal chain. The tension in the chain must be equal to the weight of the car in order to maintain constant velocity
A) True B) False