Q:
      
      
         
            
When two similar sources vibrate with slightly different frequencies , a regular rise and fall occurs in the loudness of tone. This phenomenon is known as 
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: B) beats         
         
Explanation: Beats means the periodic increase and decrease in loudness heard when two notes of nearly the same frequency are sounded simultaneously.
       
      
      
      
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