Author Question: Dust particles in a grain elevator frequently have masses of the order of 1.0 10-9 kg. If, to a ... (Read 120 times)

stevenposner · **on:** Jul 29, 2018

Dust particles in a grain elevator frequently have masses of the order of 1.0 10-9 kg.

If, to a first approximation, we model the dust particles as an ideal gas, what would be the rms speed of such a particle in air at 27C? The Boltzmann constant is 1.38 10-23 J/K . A) 3.5 10-6 m/s
B) 5.6 10-5 m/s
C) 7.8 10-4 m/s
D) 5.2 10-3 m/s
E) 4.9 10-2 m/s

Question 2

Planck's constant is about 7 10-34, in metric units. Suppose that Planck's constant were larger than it is actually is. Which of the following would then occur?

A) Individual photons would have larger energies, making it easier to observe individual photons.
B) Individual photons would have larger wavelengths, making it easier to observe individual photons.
C) Individual photons would move faster, even though the overall wave speed of electromagnetic radiation would not change.
D) Individual photons would have shorter wavelengths, making it harder to observe individual photons.
E) Individual photons would have smaller energies, making it harder to observe individual photons.