What is the minimum energy an incoming electron must have to knock a K shell electron out of an atom of molybdenum (Z = 42)?
A) 10.1 × 103 eV
B) 11.3 × 103 eV
C) 22.9 × 103 eV
D) 34.4 × 103 eV
E) 44.0 × 103 eV
C
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Cubes of sugar, 1 cm on a side, are placed in water at 25ºC. Estimate the time before the lumps have dissolved; that is, when the sugar concentration at the lump is 10% by weight. Assume that the diffusivity of sugar into water is 6.9 x 10^-10m^2/s, the convective mass transfer coefficient is 6.4 x 10^-6m^2/s, and the self-diffusivity of sugar is 1 x 10^-5m^2/s. The density of sugar may be taken as 1500 kg/m^3.
What will be an ideal response?
Mort, who is standing on the ground, throws a ball at 20 m/s eastward as measured by him. What is the ball's velocity relative to Velma, who is in a train moving eastward past Mort at 70 m/s?
A) 50 m/s eastward B) 90 m/s eastward C) 50 m/s westward D) 90 m/s westward E) 70 m/s westward
Two 10¢ coins (dimes) carrying identical charges are lying 2.5 m apart on a table. If an electrostatic force of magnitude 2.0 N is exerted on each coin by the other coin,
how large is the charge on each coin? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) 2.6 ?C B) 26 ?C C) 6.7 ?C D) 5.2 ?C E) 52 ?C
Muons at speed 0.9994c are sent round and round a circular storage ring of radius 1500 m. If a muon at rest decays into other particles after an average T = 2.2 × 10^-6 s, how many trips around the storage ring do we expect the 0.9994c muons to make before they decay?
a. 2 c. 0.2 b. 4 d. 6