Question

The first resonant length of a closed air column occurs when the length is 30.0cm . What will the second and third resonant lengths be

Answer 1

L1 = λ/4,
λ =4•L =4•30 =120 cm,
L2 =3 •λ /4 =3•120/4=90 cm,
L3 = 5•λ /4 =5•120/4=150 cm,

Answer 2

Thanks:)

Answer 3

May Allah bless you !!