The "seeing" ability or resolution of radiation is determined by its wavelength. If the size of an atom is approximately 1.3 × 10^?10 m, how fast must an electron travel to have a wavelength smaller than that of an atom? (me = 9.11 × 10^?31 kg and h = 6.63 × 10^?34 J?s)
a. 5.6E+6 m/s
b. 5.1E+7 m/s
c. 8.4E+5 m/s
d. 9.5E+6 m/s
e. 2.4E+3 m/s
a
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A long cylindrical rod, 8 cm in diameter, is initially at a uniform temperature of 20°C. At time t = 0, the rod is exposed to an ambient temperature of 400°C through a heat transfer coefficient of 20 W/(m2 K). The thermal conductivity of the rod is 0.8 W/(mK) and the thermal diffusivity is 3 × 10–6 m2/s. Determine how much time will be required for the temperature change at the centerline of the rod to reach 93.68% of its maximum value. Use an explicit difference equation and compare your numerical results with a chart solution.
GIVEN • Cylindrical rod suddenly exposed to increased ambient temperature FIND (a) Time required for the centerline temperature change to reach 93.68% of its maximum value
What characteristic distinguishes a meteorite from a terrestrial rock?
A) A meteorite is usually covered with a dark crust from burning in Earth's atmosphere. B) A meteorite usually has a high metal content. C) Meteorites have different isotope ratios of particular elements when compared to terrestrial rocks. D) Meteorites contain rare elements, such as iridium, that terrestrial rocks do not. E) All of the above are true.
The buoyant force that keeps a ship afloat is an example of Pascal's principle
a. True b. False Indicate whether the statement is true or false
What is the period of a wave described by the following function? y(x,t) = (2.00 m)cos[(6.00 m-1)x + (10.00 s-1)t] + (2.00 m)cos[(3.00 m-1)x + (5.00 s-1)t]
A) 0.628 s B) 5.00 s C) 1.26 s D) 10.0 s E) This is not a periodic function, so it does not have a period.