Question

In a standing wave pattern in a vibrating air column, nodes are formed at a distance of 4.0 cm. If the speed of sound in air is $328m{s}^{-1}$, what is the frequency of the source?

• A. 512 Hz
• B. 4.1KHz
• C. 128 Hz
• D. None of these

Answer 1

The correct option is B

4.1KHz

If you have mugged up the formula and not thorough with the concepts then you will be alarmed as to which formula to use. Closed pipe or open pipe
step 1 paint the picture guys. Let your Imagination run

Given $\frac{\lambda }{2}=4\times {10}^{-2}$

$v=\lambda f$

$\Rightarrow \frac{v}{f2}=4\times {10}^{-2}$

$v=328$

$F=4.1KHz$