The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years. Suppose you have samples of both isotopes, and that they initially contain equal numbers of atoms of these isotopes
How will the activities (number of decays per second) of the samples compare? A) The activity of the cobalt-60 sample will be greater.
B) The activities cannot be compared without more information.
C) The activities will be equal.
D) The activity of the strontium-90 sample will be greater.
A
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Three particles of equal charge, X, Y, and Z, enter a uniform magnetic field 
. X has velocity of magnitude v parallel to the field. Y has velocity of magnitude v perpendicular to the field. Z has equal velocity components v parallel and perpendicular to the field. Rank the radii of their orbits from least to greatest.
A.
B.
C.
D.
E.
.An object is placed 15. cm from a concave mirror of focal length 20. cm. If the object is 4.0 cm tall,
(a) where is the image formed? (b) how tall is it?
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A) a number of smaller nuclei combine to form a larger nucleus with the release of energy B) electrons are rearranged inside an atom, releasing energy C) an electron is ejected from the nucleus of an atom, releasing energy D) large nuclei break up into smaller nuclei with the release of energy
Wave period is the reciprocal of
a. amplitude. b. frequency. c. wave velocity. d. all of these.