Answer:
Mediums in which the speed of sound is different generally have differing acoustic impedances, so that, when a sound wave strikes an interface between
Explanation:The propagation of a wave through a medium will depend on the properties of the medium. For example, waves of different frequencies may travel 
 
        
             
        
        
        
Answer:
mass of the ball will be 1 kg 
Explanation:
We have given force F = 0.5 N 
This force must be equal to the centripetal force for the ball to revolve in the circle 
So 
Centripetal acceleration is given as 
We have to calculate the mass of the ball
We know that force is given by 

So 
m = 1 kg 
So mass of the ball will be 1 kg 
 
        
             
        
        
        
Answer:
The density of the sample is 36 g/cm³
Explanation:
m= 972g
l=3cm
V = l³ = 3³ = 27 cm³
density = mass/volume
 = 972/27
 = 36 g/cm³
 
        
             
        
        
        
Explanation:
c. if the vector is oriented at 0° from the X -axis.
 
        
             
        
        
        
Answer:
Value of electric field along the axis and equitorial axis   and
 and  respectively.
 respectively.
Explanation:
Given :
Distance between charges , 
Magnitude of charges , 
Dipole moment , 
Case A) (x,y) = (12.0 cm, 0 cm) :
Electric field of dipole in its axis ,

Putting all values and 
We get , 
Case B) (x,y) = (0 cm, 12.0 cm) :
Electric field of dipole on equitorial axis ,

Putting all values and  
 
 We get , 
Hence , this is the required solution.