Answer:
The speed of light serves as the natural phenomenon that defines the meter's length. A meter is quantified as the distance light travels in a vacuum in 1/(299792458) seconds.
This definition is superior because using a standard meter stick can lead to inaccuracies due to variations in measurements resulting from different atmospheric conditions.
Explanation:
Answer:
1984
Explanation:
Utilizing the equation;
0.693/t1/2 = 2.303/t log (Ao/A)
Where;
t1/2 = half-life of the radioactive isotope
t= age of the wine
Ao= initial activity of the wine
A= activity at time = t
Substituting values, we have 0.693/12.3 = 2.303/t log (5.5/0.688)
0.693/12.3 = 2.079/t
0.056 = 2.079/t
t= 2.079/0.056
t= 37 years
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Answer:
B
Explanation:
Flammable substances contain chemicals that react with flames, thus making it their chemical property, particularly when they encounter other materials that cause a reaction.
Response:
The pKa value is 13.0.
Clarification:
pKa + pKb = 14
For trimethylamine, Kb = 6.3 × 
Calculating pKb: pKb = - log (6.3 × )
= 1.0
Thus, pKa = 14 - pKb = 14 - 1.0
pKa = 13.0
Verification: The typical range for pKa in weak acids is from 2 to 13.
