Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. What is its atomic number and atomic mass number?
A) The atomic number is 118, and the atomic mass number is 79.
B) The atomic number is 118, and the atomic mass number is 197.
C) The atomic number is 79, and the atomic mass number is 197.
D) The atomic number is 79, and the atomic mass number is 118.
C
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Resistance and Resistivity: A certain metal wire has a cross-sectional area of 1.0 cm2 and a resistivity of 1.7 × 10-8 ? ? m. How long would it have to be to have a resistance of 1.0 ??
A. 5.9 × 106 m B. 5.9 m C. 5.9 × 104 m D. 590 m E. 5.9 km
How would you expect a star that formed recently in the disk of the galaxy to differ from one that formed early in the history of the disk?
A) It should have a higher fraction of elements heavier than hydrogen and helium. B) It should be higher in mass. C) It should be much more luminous. D) It should orbit the galactic center at a much higher rate of speed. E) All of the above differences would be expected.
Resistance and Resistivity: The length of a certain wire is doubled while its radius is kept constant. What is the new resistance of this wire?
A. It stays the same. B. It is 2 times as large. C. It is 3 times as large. D. It is 4 times as large. E. It is ½ as large.
The only way to make sound travel faster in air is to change the air's ____________
Fill in the blank(s) with correct word