Easy !  
Take any musical instrument with strings ... a violin, a guitar, etc.
The length of the vibrating part of the strings doesn't change ...
it's the distance from the 'bridge' to the 'nut'.
Pluck any string.  Then, slightly twist the tuning peg for that string,
and pluck the string again.
Twisting the peg only changed the string's tension; the length
couldn't change.
-- If you twisted the peg in the direction that made the string slightly 
tighter, then your second pluck had a higher pitch than your first one.
-- If you twisted the peg in the direction that made the string slightly 
looser, then your second pluck had a lower pitch than the first one.
        
             
        
        
        
I believe it’s B. Electrons
        
             
        
        
        
Answer:
the smallest separation between two objects is 0.8067 m 
Explanation:
 Given the data in the question;
Altitude h = 5.75 km = 5750 m
Diameter D = 4.0 mm = 0.004 m
λ = 460 nm = 4.6 × 10⁻⁷ m
Now, Using Rayleigh criterion for Airy disks resolution.
we know that, Minimum angular separation for resolving two points is;
θ = 1.22λ / D
so we substitute
θ = (1.22 × 4.6 × 10⁻⁷)  / 0.004
θ = 5.612 × 10⁻⁷ / 0.004
θ = 1.403 × 10⁻⁴ rad  
so minimum separation  =  θh
 =  θh
so we substitute
  = (1.403 × 10⁻⁴) × 5750 m
 = (1.403 × 10⁻⁴) × 5750 m
  = 0.8067 m
 = 0.8067 m
Therefore, the smallest separation between two objects is 0.8067 m 
 
        
             
        
        
        
Answer:
1.) Putting club or the putter
2.) Either the 4-, 5-, or the 6- iron club
3.) 14 clubs 
4.) The height of the golfer
Explanation:
I used to golf