In terms of the wavelength of light in soapy water, what is the minimum thickness of soap film that will reflect a given wavelength of light?
A) one-fourth wavelength
B) one-half wavelength
C) one wavelength
D) two wavelengths
E) there is no minimum thickness
A
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An atomic mass unit (amu) is 1/12 the mass of
A) an electron. B) a proton. C) a hydrogen atom. D) a carbon atom. E) a uranium atom.
Two kilograms of water at 100°C is converted to steam at 1 atm. Find the work done (in J). (The density of steam at 100°C is 0.598 kg/m3.)
a. 3.4 × 10^5 b. 1.2 × 10^5 c. 4.6 × 10^4 d. 2.1 × 10^4 e. 3.4 × 10^4
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
All but one of the following are necessary to create a functioning laser through stimulated emission. Which one is not necessary?
1.The system must consist of a stable gas. 2.The system must primarily be in an excited state. 3.The excited state must be metastable. 4.It must be possible for the emitted photons to stay within the system long enough to stimulate the emission of other photons.