How many radioactive atoms are present in a sample that has an activity of 0.5 mCi and a half-life of 10 years? (1 curie = 3.7 × 10^10 decays/s)

a. 9.5 × 10^12 atoms
b. 8.4 × 10^12 atoms
c. 7.3 × 10^12 atoms
d. 6.5 × 10^12 atoms
e. 2.7 × 10^5 atoms


B

Physics & Space Science

You might also like to view...

The pregalactic blobs had masses similar to

A) dwarf galaxies. B) the Sun. C) the Earth. D) the Milky Way. E) open clusters of stars.

Physics & Space Science

A river's suspended load and bed load may accumulate at its mouth and form a

a. sea arch. b. guyot. c. delta. d. sea mount.

Physics & Space Science

In Copernicus' model of the solar system, the planets orbited the ________ in ________ orbits.

A. Sun; circular B. Earth; circular C. Earth; elliptical D. Sun; elliptical

Physics & Space Science

Why must radio telescopes have very large dishes?

A. A large mirror is necessary to resolve radio-emitting images. B. The large dish is to compensate for atmospheric absorption of radio waves. C. Large radio telescopes are easier to repair than small instruments. D. Radio-emitting objects are very far from Earth, and so are very dim. E. Size is immaterial to quality observations.

Physics & Space Science