Tritium (3H) has a half-life of 12.3 years and releases 0.018 6 MeV energy per decay. What is the activity of a 1.4-gram sample of tritium? (NA = 6.02 × 10^23 mol–1, 1 year = 3.16 × 10^7 s, 1 MeV = 1.6 × 10^–13 J, and mt = 3.016 05 u)
a. 9.3E+12 Bq
b. 1.5E+26 Bq
c. 5.0E+14 Bq
d. 5.8E–1 Bq
e. 1.7E+3 Bq
c
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In a double slit experiment, a beam of electrons strikes a pair of slits. The slits are 15 ?m apart, and the first interference maximum lies at an angle of 0.50 µrad from the center of the interference pattern
What is the momentum of the incoming electrons? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 4.4 × 10-23 kg ? m/s B) 2.2 × 10-23 kg ? m/s C) 1.1 × 10-23 kg ? m/s D) 6.6 × 10-23 kg ? m/s E) 8.8 × 10-23 kg ? m/s
A person is dragging a packing crate of mass 100 kg across a rough horizontal floor where the coefficient of kinetic friction is 0.400. He exerts a force F sufficient to accelerate the crate forward
At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration? A) 21.8° B) 27.7° C) 30° D) 34.5° E) 45°
What level of body fat in women may signal amenorrhea and loss of body mass
a. 8-12% b. 20-25% c. 3-5% d. 15-20%.
When radium-223 (Z = 88) decays to radon-119 (Z = 86), the other particle emitted is a(n) __________
Fill in the blank(s) with correct word