Answer : The time taken for the concentration will be, 7.98 seconds
Explanation :
First order reaction : A reaction is said to be of first order if the rate is depend on the concentration of the reactants, that means the rate depends linearly on one reactant concentration.
Expression for rate law for first order kinetics is given by :
![k=\frac{2.303}{t}\log\frac{[A]_o}{[A]}](https://tex.z-dn.net/?f=k%3D%5Cfrac%7B2.303%7D%7Bt%7D%5Clog%5Cfrac%7B%5BA%5D_o%7D%7B%5BA%5D%7D)
where,
k = rate constant = 
t = time taken for the process = ?
![[A]_o](https://tex.z-dn.net/?f=%5BA%5D_o)
= initial concentration = 0.860 M
![[A]](https://tex.z-dn.net/?f=%5BA%5D)
= concentration after time 't' = 0.260 M
Now put all the given values in above equation, we get:
Therefore, the time taken for the concentration will be, 7.98 seconds
Answer:
640
Explanation:
cause you should just add the 2
The frequency of a wave is just the reciprocal of the period.For this one . . .
Frequency = 1/(period) = 1/(5 sec) = 0.2 per sec (0.2 Hz) .
The answer is all of these
Answer: its b
Explanation: A river with a gradient that is less steep than those of youthful rivers and flows more slowly. A mature river is fed by many tributaries and has more discharge than a youthful river. Its channels erode wider rather than deeper
