Two-dimensional momentum conservation works
A. for a few special cases
B. for all collisions
C. If the momenta are perpendicular to each other
D. if the angle between the original momenta is small
Ans: B. for all collisions
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A nitrogen molecule has a diameter of about 0.29 nm. The mean free path of a nitrogen molecule in a tank of dry nitrogen at room temperature and standard pressure is about 0.10 ?m. A tank containing nitrogen at standard temperature and pressure has volume V. If the tank is compressed by means of a piston to 20% of its original volume, what is the mean free path for a nitrogen molecule under the new conditions?
A. 0.089 ?m B. 0.125 ?m C. 0.080 ?m D. 0.112 ?m
A beam of light in water (of refractive index of 1.33 ) enters a glass slab (of refractive index 1.50 ) at an angle of incidence of 60.0°. What is the angle of refraction in the glass?
A) 27.5° B) 39.8° C) 60.0° D) 90.0° E) 50.2°
Which of the following types of radiation has the greatest ability to penetrate matter?
a. Gamma rays b. Beta particles c. Alpha particles d. Protons
A discrete spectrum is one that
A) only has wavelengths longer than the visible. B) never yields a line spectrum. C) yields a line spectrum. D) has continuous wavelengths. E) only has wavelengths in the visible.