- #36

harini07

- 79

- 2

Yes even I was thinking the same. It could be one 1 which is more convincing :/ may be the answer key is wrong.let me clear this one last thing.i just want to mark this question solved..It's.there for a long time [emoji39] let's say there are three waves with frequencies (sorry again) n+1,n,n-1 the beat frequency of the three waves will be 2 (by taking LCM ) right?haruspex said:That is demonstrably false. The pattern I posted repeats every 1 second ( which you can prove using the LCM of the three periods 1/3, 1/4, 1/7 of the three pairwise beat frequencies). Within that, you can see there are 7 more-or-less evenly spaced bulges each second, so you could make a case for the answer 7. One bulge is a lot smaller than the other 6, but if we discount that then the spacing becomes rather uneven, so no longer qualifies as a "beat".