Approximately how many radioactive atoms are present in a tritium sample with an activity of 0.20 × 10^?6 Ci and a half-life of 12.3 years? (1 Ci = 3.7 × 10^10 decays/s)
a. 1.3E+5
b. 1.1E+2
c. 3.5E–6
d. 4.1E+12
e. 2.9E+12
d
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Of the outer planets, ________ has the smallest diameter.
A. Saturn B. Jupiter C. Neptune D. Uranus E. Pluto
The y-component of the electric field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation
Ey = (375 N/C) cos[kx - (2.20 × 1014 rad/s)t]. (c = 3.0 × 108 m/s) (a) What is the largest that the x-component of the wave can be? (b) What is the largest that the z-component of the wave can be?
The brightest planet has an apparent magnitude of about – 4 and is named
a. Jupiter. b. Saturn. c. Mars. d. Venus.
if you trace back the history of a carbon atom in your little finger through all of cosmic history, where did this atom originate?
What will be an ideal response?