Then another condition if you apply at x equal to capital L y equal to 0. sin kL equal to 0. from here you are getting kL equal to n pi n is integer. L equal to n lambda by 2 ok, lambda is an as I told wave length wave length. that periodicity in space periodicity in length, that is the wavelength and n is called mode ok.
वरील प्रमाणे हे समीकरण सोडवायचे आहे. दुसरी अट लागू केल्यानंतर आपल्याला 2 πL/λ=nπ मिळेल ज्यामध्ये λ लहरींची लांबी तर n याला मोड म्हणतात.