Most of the mass of a galaxy is contained in the
a. massive O and B stars in the galaxy.
b. H I regions of the galaxy.
c. H II regions of the galaxy.
d. dark matter of the galaxy.
e. disk of the galaxy.
d
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On a hot summer day, the temperature is 40.0°C and the pressure is 1.01 × 105 Pa
Let us model the air as all nitrogen of molecular mass 28.0 g/mol having molecules of diameter 0.500 nm that are moving at their root-mean-square speed. Avogadro's number is 6.02 × 1023 molecules/mol, the ideal gas constant is 8.31 J/mol ? K, and the Boltzmann constant is 1.38 × 10-23 J/K. Calculate reasonable estimates for (a) the root-mean-square speed of the nitrogen molecules. (b) the average distance a typical molecule travels between collisions. (c) the average time a molecule travels between collisions, assuming that the molecules are moving at their root-mean-square speeds. (d) the number of collisions an average molecule undergoes per second. What will be an ideal response?
The alpha scattering experiment resulted in the discovery of the ______________
Fill in the blank(s) with correct word
The maximum permissible workday dose for occupational exposure to radiation is 26 mrem
A 55-kg laboratory technician absorbs 3.3 mJ of 0.40-MeV gamma rays in a workday. The relative biological efficiency (RBE) for gamma rays is 1.00. What is the ratio of the equivalent dosage received by the technician to the maximum permissible equivalent dosage? A) 0.32 B) 0.30 C) 0.25 D) 0.23 E) 0.28
Where will you find a shield volcano?
What will be an ideal response?