A fossil is found in a layer of strata above another layer dated at 10 million years and below another layer dated at 5 million years. From this we can deduce the age of the fossil to be
A) older than 10 million years
B) younger than 5 million years
C) we can tell nothing about the fossil's age from this data
D) between 5 and 10 million years old
D
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A semiconductor is produced by doping Group IV silicon with 1023 atoms per cubic meter of Group III gallium. Assume that at room temperature this semiconductor is in the extrinsic range of operation.
(a) What type of semiconductor is this? (b) Calculate the room-temperature electrical conductivity of this semiconductor. (c) Clearly state any assumptions you made in calculating the electrical conductivity in part (b).
The majority of dark matter is probably not protons and neutrons
Indicate whether the statement is true or false
The mass density of normal air is, at 293 K,
and the average molecular mass of air is 29.0 u. If the mean free path of an air molecule at room temperature is measured to be 111 nm, what is the average diameter of an air molecule.
A. 0.31nm B. 0.26nm C. 0.28nm D. 0.49nm E. 0.56nm F. 0.23nm
When atmospheric pressure increases, what happens to the absolute pressure at the bottom of a pool?
A) It does not change. B) It increases by a lesser amount. C) It increases by the same amount. D) It increases by a greater amount. E) It depends on the depth of the pool.