Answer:
c. 307 nm
Explanation:
angular position of first dark fringe =  λ / d ,   λ is wavelength and  d is width of slit . 
(40 x π ) / 180 = 410 / d 
angular position of second  dark fringe =  2 x λ / d ,   λ is wavelength and  d is width of slit . 
(60 x π ) / 180 = 2 x λ / d 
Dividing these equations 
60 / 40 =  2 x λ / 410 
 λ = 307.5 nm. 
 
        
             
        
        
        
F=K*X,
F=M*a 
M*a=K*X
2.5*9.81=K*0.0276
24.525=K*0.0276
24.525/0.0276=K
K= 888.6 N/m ---- force constant 
assuming 2.5 refers to the new extension, just divide F/ 0.025
to get
981N/m 
        
             
        
        
        
The pertinent equation here is F=ma.  You haven't shared the mass of the box, so I will use M to represent that mass.
Then F = M(<span>2.3 m/s^2)        (answer)</span>
        
                    
             
        
        
        
The earth's magnetic field is associated with the <span>core.</span>
        
                    
             
        
        
        
Answer: Really 
Explanation:
Just look it up for this page and maybe you will find an anwser sheet.