The mean free path for a nitrogen molecule in a tank of dry nitrogen at 273 K is 0.15 ?m. If the diameter of a nitrogen molecule is 0.29 nm, what is the pressure in the tank?
A. 95.1 kPa
B. 48 kPa
C. 211 kPa
D. 299 kPa
E. 67.2 kPa
E. 67.2 kPa
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Select the best filter for a cobalt x-ray tube that will reduce the intensity of the K? line and transmit the cobalt K? line.
(a) What are the wavelength of the cobalt K? and K? line? (b) What is your selected filter material? (c) What is the wavelength of the K absorption edge of your selected filter material?
An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
The circuit below shows three resistors in series. R3 > R2 > R1. The resistors are all made of the same wire with the same diameter but have different lengths. Rank the magnitudes of the electric fields in the resistors from least to greatest
a.
E3 < E2 < E1.
b.
E2 < E1 = E3.
c.
E1 = E2 = E3.
d.
E1 = E3 < E2.
e.
E1 < E2 < E3.
The percentage composition by mass (to the nearest 0.1) of C in sugar, C12H22O11, is ______________
Fill in the blank(s) with correct word