Tritium (3H) has a half-life of 12.3 years and releases 0.0186 MeV energy per decay. What is the activity of a 9.0-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 = 3.01605 u)
a. 1.3 × 10^16 Bq
c. 3.6 × 10^14 Bq
b. 1.1 × 10^15 Bq
d. 3.2 × 10^15 Bq
D
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Acceleration: Suppose that a car traveling to the west (-x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration must be correct?
A. Its acceleration is positive. B. Its acceleration is negative. C. Its acceleration is zero. D. Its acceleration is decreasing in magnitude as the car slows down.
Series/Parallel Circuits: Two 100-W light bulbs of fixed resistance are to be connected to an ideal 120-V source. What are the current, potential difference, and dissipated power for each bulb when they are connected(a) in parallel (the normal arrangement)?(b) in series?
What will be an ideal response?
What condition is necessary in an interstellar gas cloud for it to begin collapsing?
A) a low density B) a low temperature C) a high temperature D) a high heavy element content E) a low heavy element content
What is the inductance of a series RL circuit in which R = 1.0 K? if the current increases to one-third of its final value in 30 ?s?
A. 74 mH B. 99 mH C. 49 mH D. 62 mH E. none of the above