Let 
and 
are two sources and if wave from 
reaches some common point 
be covering seven times of wavelength 
and from 
by covering nine times of wavelength 
.
Which of the following statement(s) is/are correct?
(i) 
(ii) Waves from 
arrives exactly two cycles earlier than waves from 
.
(iii) At point 
, waves from 
and 
are in phase.
(iv) At point 
, waves from 
and 
are out of phase.
Text Solution
Verified by ExpertsB
Given, 
and 
For constructive interference at any point, the path difference between waves should be 
.
Now, we have, 
Therefore, the sources 
and 
are said to interfere constructively.
The waves emanating from 
will arrive exactly two cycles earlier than the waves from 
as 
and will again be in phase.
Thus, the statements given in option are incorrect, rest are correct.
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