Question 202: Waves

Question

A pipe open at both ends has a fundamental frequency $$f$$ in air. The pipe is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now :

Accepted Answer

The fundamental frequency in case $$(a)$$ is $$f = {v \over {2\ell }}$$
The fundamental frequency  in case $$(b)$$ is
$$f'{v \over {4\left( {\ell /2} \right)}} = {u \over {2\ell }} = f$$

Answer

$$2f$$

Answer

$$f$$

Answer

$${f \over 2}$$

Answer

$${3f \over 4}$$

Waves

A pipe open at both ends has a fundamental frequency $f$ in air. The pipe is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now :

Choose the correct answer: