@Abhisar
Two violins are being played in a duet. At a certain moment, one violin plays a note of frequency 934 Hz, causing a beat of frequency 2 seconds. What is the set of possible frequencies that the second violin could have played at this moment?

932 Hz and 936 Hz
936 Hz and 938 Hz
939 Hz and 944 Hz
930 Hz and 938 Hz

Question

@Abhisar 
Two violins are being played in a duet. At a certain moment, one violin plays a note of frequency 934 Hz, causing a beat of frequency 2 seconds. What is the set of possible frequencies that the second violin could have played at this moment? 
  
 932 Hz and 936 Hz 
 936 Hz and 938 Hz 
 939 Hz and 944 Hz 
 930 Hz and 938 Hz

akohl · Answer

Do you just add and subtract 2 from  934

akohl · Answer

@aaronq

aaronq · Answer

the beat frequency is the difference between the two, so it could be 934$\pm$2