The change of color. Each color has a different wavelength therefore a different frequency.
        
                    
             
        
        
        
Answer:
The ratio of their orbital speeds are 5:4.
Explanation:
Given that,
Mass of A = 5 m
Mass of B = 7 m 
Radius of A = 4 r
Radius of B = 7 r
The orbital speed of satellite A,
 ......(I)
......(I)
The orbital speed of satellite B,
 ......(I)
......(I)
We need to calculate the ratio of their orbital speeds
Using equation (I) and (II)

Put the value into the formula


Hence, The ratio of their orbital speeds are 5:4.
 
        
             
        
        
        
Explanation:
First convert the speed into m/s and time into seconds 
 
        
             
        
        
        
Electricity flows from positive to negative