Uncertainty Principle Using Momentum and Position: If the uncertainty in the position of a proton is 0.053 nm, what is the uncertainty in its speed? (h = 6.626 × 10-34 J ? s, mproton = 1.67 × 10-27 kg)
A. 2.2 m/s
B. 0.60 km/s
C. 0.98 km/s
D. 37 m/s
E. 1.2 km/s
Answer: E
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Molecular Speeds: The rms speed of a certain sample of carbon dioxide molecules, with a molecular weight of 44.0 g/mole, is 396 m/s. What is the rms speed of water vapor molecules, with a molecular weight of 18.0 g/mol, at the same temperature as the carbon dioxide?
A. 253 m/s B. 387 m/s C. 421 m/s D. 506 m/s E. 619 m/s
The lowest mass object that can initiate thermonuclear fusion of hydrogen has a mass of about
a. 1 solar masses b. 80 solar masses c. 8 solar masses d. 0.08 solar masses e. 0.001 solar masses
What radionuclide has a well-known percentage
content in all living organisms until the time that they die, and so can be used to determine how long fossil samples have been dead? a) carbon-14 b) carbon-12 c) uranium-238 d) uranium-235
Electron diffraction shows
a. that electrons behave like waves b. the photoelectric effect c. characteristic x ray spectra d. that electrons in atoms have only certain allowed energies