Answer:
The decibel level is <em>0.203 dB.</em>
Explanation:
The relationship between the sound intensity, I, and the distance, r, is given below:
<em>
</em>
Therefore,
<em>
</em>
∴ <em>
</em>
<em>So 
</em>
<em>
....... (1)</em>
Fitting the given terms into equation (1), we can obtain the decibel level on Rodriguez Island:
-- pick a planet from the table
-- take it's mass and radius from the table, and plug them into the big ugly formula above the table
-- do the arithmetic with your pencil or your calculator. The answer is the acceleration of gravity on the planet you picked. Write it down so you don't lose it.
-- do the same for the other 3 planets in the table
Answer:
2.16 x 10^7 years
Explanation:
R = 6.9 x 10^20 m
ω = 9.2 x 10^-15 rad/s
T = 2π / ω
T = ( 2 x 3.14 ) / ( 9.2 x 10^-15)
T = 6.826 x 10^14 second
T = 2.16 x 10^7 years
Answer:
Rate = k[aryl halide][nucleophile]
Explanation:
The simple aryl halides are almost inert to usual nucleophilic reagents but considerable activation on the ring can be produced by the addition of strongly electron-attracting substituents on either the ortho or para positions, or both. These groups deactivate the ring to allow the attack of the nucleophille on the ring.
Thus, these reactions can occur by following addition-elimination mechanism in which the nucleophille first attacks the aryl halide and then the elimination of the leaving group takes place.
<u>Kinetic studies of this type of mechanism demonstrate that the reactions are of second-order kinetics– first order w.r.t. nucleophile and also, first-order w.r.t. aromatic substrate. The rate determining step (r.d.s.) is the formation of the addition intermediate.</u>
Thus,
<u>Rate = k[aryl halide][nucleophile]</u>
