Answer:
Im gonna say it is answer A:) Hope this helps!
Explanation:
 
        
                    
             
        
        
        
I used to wish that I can fly
        
             
        
        
        
Answer:
From the previous explanation Student No. 1 has the correct explanation
Explanation:
When the fluorescent lamp emits a light it has the shape of its emission spectrum, this light collides with the atoms of Nitrogen and excites it, so these wavelengths disappear, lacking in the spectrum seen by the observed, for which we would see an absorption spectrum
The nitrogen that was exited after a short time is given away in its emission lines, in general there are many lines, so the excitation energy is divided between the different emission lines, which must be weak
From the previous explanation Student No. 1 has the correct explanation
 
        
             
        
        
        
Answer:
a
The  speed of  wave is   
b
The new speed of the two waves is 
Explanation:
From the question we are told that 
     The mass of the string is  
     The length is  
     The tension is  
Now the velocity of the first wave is mathematically represented as 
      
Where   is the linear density which is mathematically represented as
 is the linear density which is mathematically represented as 
       
substituting values    
      
      
So 
    
    
Now given that the Tension, mass and length are constant the velocity of the second wave will same as that of first wave (reference PHYS 1100 )
      
 
        
             
        
        
        
An eraser, a type of rubber, uses static friction when rubbed across a sheet of paper.