- The wavelength of the red light in "nanometer" is 7×  
- Wavelength is given as : 7× meter meter
-  1 nanometer =  ( meter) meter)
- Let X= value of the wavelength in nanometer.
 1 nanometer  =  meter
 meter
X  nanometer = 7×  meter
  meter
- <em>If we Cross multiply</em>
X  nanometer = ( )
)
X= 7× nanometer
  nanometer
Therefore, the wavelength in "nanometer" is 7× 
 
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I think this type of equation could be conducted in simple division equation since it does not involve drop rate.
we know that there is 500 ml of substance and should be infused within 8 hours period.
So the flow rate in ml/hr would be: 
500/8 = 62.5 ml/hr                                                                                    
        
             
        
        
        
Note: I'm not sure what do you mean by "weight 0.05 kg/L". I assume it means the mass per unit of length, so it should be "0.05 kg/m".
Solution:
The fundamental frequency in a standing wave is given by

where L is the length of the string, T the tension and m its mass. If  we plug the data of the problem into the equation, we find

The wavelength of the standing wave is instead twice the length of the string:

So the speed of the wave is

And the time the pulse takes to reach the shop is the distance covered divided by the speed:
 
 
        
        
        
I only know P and V and P is pressure and V is volume 
        
             
        
        
        
128.1-127.8= 0.3Hz 
<span>129.1-128.1= 1.0Hz </span>
<span>129.1-127.8= 1.3Hz</span>