Suppose that a certain atom had just 4 different energy levels. How many different frequencies could be emitted by this atom?
A) 6
B) 10
C) 16
D) 4
E) an infinite number.
A
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Rocks are found on the surface of another planet which appear to have been formed from the solidification of molten lava. Given this, they are most likely to be classified as
A) meteoritic B) metamorphic C) sedimentary D) igneous
Internal energy is a state function
Indicate whether the statement is true or false
A stonecutter's chisel has an edge area of 0.40 cm2 . If the chisel is struck with a force of 45 N, what is the pressure exerted on the stone?
a. 1.1 × 10^6 Pa c. 5.5 × 10^4 Pa b. 1.1 × 10^5 Pa d. 1.1 × 10^3 Pa
A brass bar (E 5 110 MPa) of length L 5 2.5 m has diameter d1 5 18 mm over one-half of its length and diameter d2 5 12 mm over the other half. Compare this nonprismatic bar to a prismatic bar of the same volume of material with constant diameter d and length L. The elon-gation of the prismatic bar under the same load P 5 25 kN is approxi-mately:
(A) 3 mm
(B) 4 mm
(C) 5 mm
(D) 6 mm