# Measuring the Speed of Sound in Air Using a Smartphone and a Cardboard Tube

## TL;DR

This paper presents an economical method to measure the speed of sound in air using a smartphone and a cardboard tube, achieving accuracy within 3% of theoretical values.

## Contribution

It introduces a low-cost, accessible variation of Kundt's tube experiment utilizing common smartphone technology.

## Key findings

- Measured speed of sound within 3% of theoretical prediction
- Demonstrated feasibility of using smartphones for physics experiments
- Provided an economical alternative to traditional methods

## Abstract

This paper demonstrates a variation on the classic Kundt's tube experiment for measuring the speed of sound. The speed of sound in air is measured using a smartphone and a cardboard tube, making the experiment very economical in terms of equipment. The speed of sound in air is measured to within 3\% of the theoretical prediction.