From Boyle's law, the volume of a fixed mass of a gas is inversely proportional to its pressure at constant absolute temperature. 
Therefore; P1V1 =P2V2; where PV is a constant
hence; 12 × 6 = 3× p2
           p2 = 72/3
                = 24 atm
Therefore; the new pressure will be 24 atm
        
             
        
        
        
Friction but i may be wrong
        
             
        
        
        
Answer: The correct answer is a.
Explanation:
Electromagnetic wave is a wave in which the magnetic field and the electric field are perpendicular to each other. 
Both fields are directed in the direction of the propagation of the electromagnetic wave. It travels with the speed of the light. 
The motion of the electric field produces both electric field and the magnetic field.
The electromagnetic waves are produced when an electric charge vibrates or accelerates.
 Therefore, the correct option is (a).
 
        
                    
             
        
        
        
Answer:
What is the acceleration of your vehicle?
+ 2.0 m/s^2✔
- 2.0 m/s^2
+ 8.0 m/s^2
- 6.0 m/s^2