Answer:
The  length is  
Explanation:
From the question we are told that 
    The frequencies of the two successive harmonics are  ,
 ,  
    The speed of sound in the air is  
Generally the frequency of a given harmonic is mathematically represented as 
      
Here  n defines  the position of the harmonics 
 Now since the position of both harmonic is not know but we know that they successive then we can represented them mathematically as 
     
and  
      
So 
    
=>  
=>   
 
        
             
        
        
        
Answer:
Please refer to the figure. 
Explanation:
The crucial point here is to calculate the enclosed current. If the current I is flowing through the whole cross-sectional area of the wire, the current density is

The current density is constant for different parts of the wire. This idea is similar to that of the density of a glass of water is equal to the density of a whole bucket of water. 
So, 

This enclosed current is now to be used in Ampere’s Law.

Here,  represents the circular path of radius r. So we can replace the integral with the circumference of the path,
 represents the circular path of radius r. So we can replace the integral with the circumference of the path,  .
.
As a result, the magnetic field is

 
        
             
        
        
        
Answer:
B :)
Explanation:
:) JUST TRUST ME I GOT IT CORRECT
 
        
                    
             
        
        
        
lol what is this question
 
        
             
        
        
        
A tsunami is caused by earthquakes in the ocean. the earthquakes make a big rumble and the big wave travels and may go on the shore and its a called a tsunami hope this helpsBrainliest??