Answer:
The force applied to make the object move
 
        
                    
             
        
        
        
Using the formula v=f times lambada
then v=the speed of light. 
and f=what’s we’re looking for
and lambada=the wavelength. 
so then you sub what you have (v and lambada) in the formula. 
then multiply the frequency(f) by the given wavelength and then solve for f
 
        
        
        
I think:
In motion- 40
Not moving- 20
        
             
        
        
        
Test:
Performing a Litmus Test
Result:
Litmus paper gives the user a general indication of acidity or alkalinity as it correlates to the shade of red or blue that the paper turns. 
- To test the pH of a substance, dip a strip of litmus paper into the solution or use a dropper or pipette to drip a small amount of solution onto the litmus paper.
- Blue litmus paper can indicate an acid with a pH between 4 and 5 or lower. 
- Red litmus paper can show a base with a pH greater than 8. 
- If a solution has a pH between 5 and 8, it will show little color change on the litmus paper.
- A base tested with blue litmus paper will not show any color change, nor will an acid tested with red litmus paper register a change in color.