Select the correct answer.
What is the wavelength of radio waves?
A.
between 1 x 10-3 and 1 x 10-1 meters
B.
less than 1 x 10-11 meters
more than 1 x 10-4 meters
D.
between 1 x 10-8.4 x 10-7 meters
E.
between 4 x 10-7.7 x 10-7 meters
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Areaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is: