1. Why did we use a tuning fork, not just any source of sound, like a music CD,

Question

1. Why did we use a tuning fork, not just any source of sound, like a music CD, in this experiment? The experiment was seeing the effects of standing waves in air. The speed of sound in the air can be determined using the properties of standing waves and resonance. To do so, we used a resonance tube and a tuning fork. Looking up speed of sound of youtube shows the lab.

2. Let’s say you use a different fork of unknown frequency and you hear the first two resonances with the water level at 23 cm and 75 cm. What is the frequency of the fork?

3. If the room temperature goes up, which of the following quantities will change and why?

1. Frequency of the fork

2. Wavelength of the sound

3. Speed of sound

Explanation / Answer

1)

In this experiment we determine the speed of the sound with the help of formula for frequency of vibration. Speed is the product of frequency and wavelength. So, the frequency of sound should be constant through out the experiment. This will be possible only by taking a tunning fork of known frequency as source of sound. If we took cd as sound source, frequency is not constant as it has mixing of several frequencies.

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