kundt's tube

space

U+0020

apostrophe

U+0027

latin small letter b

U+0062

latin small letter d

U+0064

latin small letter e

U+0065

latin small letter k

U+006B

latin small letter n

U+006E

latin small letter s

U+0073

latin small letter t

U+0074

latin small letter u

U+0075