In a Kundt's tube experiment , with a wooden rod170 cm along , clamped at the middle , the lycopodium powder gets heated up at regular intervals of 13.4 cm , the experiment being performed with air . If the frequency of vibrations be 1270 Hz , find the velocity of sound in air and in the wooden rod.

In a Kundt's tube experiment , with a wooden rod170 cm along , clamped

1.	In a Kundt's tube experiment , with a wooden rod170 cm along , clamped at the middle , the lycopodium powder gets heated up at regular intervals of 13.4 cm , the experiment being performed with air . If the frequency of vibrations be 1270 Hz , find the velocity of sound in air and in the wooden rod.
Answer» Solution :The wavelengths of sound waves in air and in rod will be respectively , ` lambda_(a) = 2 XX 13.4 cm = 26.8 cm` , and `lambda_(r) = 2 xx 170 cm = 340 cm` Since VELOCITY ` v= LAMBDA F` `:. "Velocity od sound in air" v_(a) = l_(a) f` `26.8 cm xx 1270 s^(-1) = 340 m//s` `:. "Velocity of sound in wooden rod"v_(r) = lambda_(r) f` ` = 340 cm xx 1270 s^(-1)` `= 4318 m//s`