When we consider a thin horizontal layer of the atmosphere, of thickness dy, of area A, with pressure P on the bottom, with an average mass m per molecule, and nV molecules per unit volume, the magnitude of the difference of the pressure at the top and bottom of the layer is given by dP =
A. mgdy.
B. mgnVdy.
C. mgAdy.
D. mgnVAdy.
E. mgnVAPdy.
Answer: B
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Mort observes Velma's light-clock, as Velma passes. Mort thus observes Velma's clock to be
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