Explanation:
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Answer:
C. Quadruple the intensity
Explanation:
The intensity of the sound is proportional to square of amplitude of the sound.
I ∝ A²

When the given sound is twice loud as the initial value, then the new amplitude is twice the former.
A₂ = 2A₁

Thus, to make a given sound seem twice as loud, the musician should Quadruple the intensity
 
        
             
        
        
        
The magnitude of Alioth ( the brightest star in the big dipper ) is 1.76 and it is about 81 light years distant from Earth. 
        
                    
             
        
        
        
Answer: d. 5 m/s^2
Explanation:
Acceleration is the change in velocity in a given time. 
a = (30-20)/2 = 5