In interactions taking place by the weak force, which of the following quantities are conserved?
a. electric charge
b. baryon number
c. mass-energy
d. strangeness
e. linear momentum
f. angular momentum (spin)
a, b, c, e, f
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Molecular Speeds: If the temperature of an ideal gas is increased from 20°C to 40°C, by what percent does the speed of the molecules increase?
A. 3% B. 30% C. 70% D. 100%
On a cosmic calendar, in which the history of the universe is compressed into 1 year, when did the dinosaurs become extinct?
A) in late December B) in late November C) in late October D) in late September E) in late August
The condition 2d sin(?) = n? for X-ray diffraction maxima is attributed to
A) Young. B) Rayleigh. C) Bragg. D) Brewster. E) Land.
Why are troops instructed to break step when they are marching over a bridge?
What will be an ideal response?