Which of the following would not have significant effect on the probability distribution of position of an electron (in a given combination of quantum numbers) in the hydrogen atom?
b.
Around the z-axis, there is symmetry due to the canceling out of exponentials in the azimuthal solution to Schrödinger's equation.
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In a chiller unit R-123 evaporates at -20ºC in 1-cm-inside-diameter horizontal tubes. The inside surface temperature of the tubes is estimated as 5ºC and film boiling is assumed. Saturated liquid flows in at 20 g/s and is to leave as saturated vapor. Estimate the necessary tube length required. Use hnf = 183.4 kJ/kg and hng = 367.9 kJ/kg for R-123.
What will be an ideal response?
Elementary Particles: Which of the following particles (or groups of particles) are made up of quarks?
A. protons, neutrons, and electrons B. electrons and neutrinos C. photons D. protons and neutrons E. All particles except for photons are made up of quarks.
Which of the following statements is an inference from a model (rather than an observation)?
A) The Sun emits neutrinos. B) The photosphere emits visible light. C) The photosphere is made out of mainly hydrogen and helium. D) The corona is hotter than the photosphere. E) The Sun's core is gradually turning hydrogen into helium.
In the hydraulic device shown, when the small piston is pushed down 10 cm with a force of 10 N, the large piston is raised 1 cm. This means that the large piston is capable of lifting
1) 10 N, 2) 100 N, 3) 1000 N, 4) any amount of weight, which illustrates 5) that impulse is equal to a change in momentum. 6) (F × d) input = (F × d) output. 7) Newton's second law. 8) that the stored energy that a body possesses may be transformed into other forms of energy.