A 3.0 m organ pipe is open at both ends and contains air. The velocity of sound in air is 331 m/s. What is the wavelength of the lowest frequency mode?
A. 1.5 m
B. 3.0 m
C. 6.0 m
D. 9.0 m
E. 12.0 m
C. 6.0 m
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The ability of a steel to be hardened to a specific depth is the _________.
Fill in the blank(s) with the appropriate word(s).
A planet found orbiting a star other than the sun is called a(n) ____________________
Fill in the blank(s) with correct word
Carbon-14 dating can reliably date ancient archeological samples up to approximately how many years?
A) 100 million B) 50 thousand C) 5 million D) 10 billion E) 5 thousand
Why did scientists expect that the nucleus contained more than just protons?
a. By symmetry arguments about protons. b. Because nuclei have about half as many mass units as can be explained by the amount of their positive charge. c. Because without the negative charge of the neutron, electric repulsion between the positively charged protons would tear the nucleus apart. d. Because nuclei have less mass than could be accounted for by the amount of their positive charge. e. Because nuclei have approximately twice as many mass units as can be explained by the amount of their positive charge.