A pure sample of 226Ra contains 1.5 × 10^13 atoms of the isotope. If the half-life of 226Ra = 1.6 × 10^3 years, what is the decay rate of this sample? (1 Ci = 3.7 × 10^10 decays/s)
a. 8.0E–9 Ci
b. 2.1E+2 Ci
c. 5.6E–9 Ci
d. 1.8E–1 Ci
e. 2.5E–1 Ci
c
You might also like to view...
The index of refraction of a type of glass is 1.50, and the index of refraction of water is 1.33. If light enters water from this glass, the angle of refraction will be
A) greater than the angle of incidence. B) equal to the angle of incidence. C) less than the angle of incidence.
Joe and Bill are playing tug-o-war. Joe is pulling with a force of 200 N. Bill is simply hanging on, but skidding towards Joe at a constant velocity. What is the force of friction between Bill's feet and the ground?
A) 200 N B) 400 N C) Less than 200 N D) Greater than 200 N, but less than 400 N
The gravitational field is equivalent to:
a. the inertial mass. c. a clock running slowly. b. an event horizon. d. an accelerated frame of reference.
The largest voids may span 300 million light years across
Indicate whether the statement is true or false