One mole of hydrogen gas and 
mole of helium gas are mixed in a container and maintained at a fixed temperature T. How does the total pressure PH exerted by the hydrogen molecules compare to the total pressure PHe exerted by the helium molecules? Note that a molecule (atom) of helium has twice the mass of an H2 molecule.
A. PH = 2PHe
B. PH = 
PHe
C. PH = PHe
D. PH =
PHe
E. PH = 
PHe
F. Other (specify)
A. PH = 2PHe
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If you move an electron from the ground state to a higher energy level, the atom becomes an excited atom
a. True b. False Indicate whether the statement is true or false
Matter Waves: Protons are being accelerated in a particle accelerator. When the energy of the protons is doubled, their de Broglie wavelength will
A. increase by a factor of 4.
B. increase by a factor of 2.
C. decrease by a factor of 2.
D. increase by a factor of 
.
E. decrease by a factor of 
.
An airplane needs to reach a forward velocity of to take off. On a runway, what is the minimum uniform acceleration necessary for the plane to take flight if it starts from rest?
A) 0.79 m/s2 B) 0.87 m/s2 C) 0.95 m/s2 D) 1.0 m/s2