The rms velocity of a He molecule in helium gas with a temperature of 20
is 1,352 m/s. What is the rms velocity of the molecule if the temperature of the gas is tripled?
A. 2,340 m/s
B. 3,640 m/s
C. 3,980 m/s
D. 4,120 m/s
E. 4,500 m/s
A. 2,340 m/s
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Circular Apertures: Light from a He-Ne laser of wavelength 633 nm passes through a circular aperture. The resulting pattern is observed on a screen 4.0 m behind the aperture, where the width of the central bright circle is 1.1 cm. What is the diameter of the hole?
A. 560 ?m B. 9.8 ?m C. 32,000 ?m D. 4700 ?m
The resistance of a 100-cm wire of cross sectional area 2 × 10-6 m2 is 400 ?. What is the resistivity of the material of this wire?
A) 0.8 × 10-4 ?m B) 8 × 10-4 ?m C) 0.8 × 10-5 ?m D) 0.8 × 10-6 ?m E) 8 × 10-6 ?m
If a wave from one slit of a Young's double-slit set-up arrives at a point on the screen one-half wavelength behind the wave from the other slit, what is observed at that point?
a. dark fringe c. gray fringe, neither dark nor bright b. bright fringe d. multi-colored fringe
In which of the following cases does the automobile have an acceleration?
A) An auto rounding a curve at constant speed. B) An auto moving along a straight (or steady) upward incline at constant speed. C) Both of the above. D) None of the above.