The frequency of the wave has not changed.
In fact, the frequency of a wave is given by:

where v is the wave's speed and 
 is the wavelength.
Applying the formula:
- In air, the frequency of the wave is:

- underwater, the frequency of the wave is:

So, the frequency has not changed.
 
        
                    
             
        
        
        
Answer:
sun, earth, capitol building, human, atom
Explanation:
Gravity is directly proportional to the size of an object. Therefore, the object with the most mass will have the greatest force of gravity. We know this from the equation. 
 
        
             
        
        
        
time=distance/speed
1.6/100 secs = 0.016secs=16millisecs
 
        
             
        
        
        
Answer:
no
Explanation:
due to the refraction of light,meaning bending of light when it passes from diffrent mediums with diffrent densities
(probably mot the complete ans but smtg like this)