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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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
Why are troops instructed to break step when they are marching over a bridge?
What will be an ideal response?
The condition 2d sin(?) = n? for X-ray diffraction maxima is attributed to
A) Young. B) Rayleigh. C) Bragg. D) Brewster. E) Land.
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%