A gas-powered lawnmower is rated at 98 db. how many times more intense is the sound of this mower than that of an electric-power
1 answer:
You might be interested in
The frequency of the wave is 6800 Hz
<u>Explanation:</u>
Given:
Wave number, n = 20
Speed of light, v = 340 m/s
Frequency, f = ?
we know:
wave number =
Therefore, the frequency of the wave is 6800 Hz
Answer:
D
Explanation:
- The rate of the Diels-Alder is orders of magnitude faster if there is an electron-withdrawing group on the dienophile. For example, replacing a hydrogen on ethene with the electron-withdrawing group CN results in about a 10^5 increase in the reaction rate.
- Other common electron withdrawing functional groups that will accelerate the Diels Alder reaction of dienophiles include aldehydes, ketones, and esters.
- In short, any functional group conjugated with the pi bond which can act as a pi acceptor will accelerate a Diels-Alder reaction with a typical diene.
- See attachment for graphical explanation.
To calculate the force between two negative charges, we use the formula which is given by the Coulomb`s Law as
Here, and
are the charges on the pith balls, r is the separation between the charges and k is constant and its value is
.
Given and
.
Substituting these values in above formula we get,
Thus, the repulsive force between two pith balls is .