Answer:
I Will say the Answer is A
Explanation:
 
        
                    
             
        
        
        
Explanation:
It is given that,
Uncertainty in the speed of an electron, 
According to Heisenberg uncertainty principle, 

 is the uncertainty in the position of an electron
 is the uncertainty in the position of an electron
Since, 



So, the uncertainty in its position is  . Hence, this is the required solution.
. Hence, this is the required solution.
 
        
             
        
        
        
Answer:
D.
boulder-sized rocks that come from the asteroid belt
 
        
             
        
        
        

Since initial velocity is zero hence , u = 0
=> d = 1/2 * a * t2

on solving we get
d = 86.436 metres
Note ; Here Gravitational Acceleration is take as , g = 9.8 m/s2