Answer:
Option D, A subject is observed both before and after two exposures to the treatment.
Explanation:
In A-B-A-B design the alphabets have following meaning
a) First A – It is the baseline value or the value measured before treatment
b) First B – It is the treatment measurement
c) Second A - It is the withdrawal of treatment
d) Second B – It is the reintroduction of treatment
The second A is known as the reversal phase in which the intervention is withdrawn to see if the target behavior returns to the baseline behaviour
Thus , there are two measurements involved one before the intervention and second after the intervention
Option D is correct
<span>Carbon is the only element that can form many different compounds. Each carbon atom can form four chemical bonds to other atoms. This allows it to form rings and chains.</span>
Answer:
Explanation:
The detailed steps are as shown below
- but magnitude of force F = √ [ 1 - v²/c²]
but acceleration twice as great as the force required to produce the same acceleration;
4 = 1 / [ 1 - v²/c²]
1/4 = 1 - v²/c²
v²/c² = 3/4
v/c = √ [3/4]
v = 0.87c
but speed of light c = 3 x 10^8m/s
v = speed of the particle = 0.87( 3 x 10^8m/s)
v = 2.61m/s
A) A mixture because they can be taken apart without changing the physical form
