TO Examine Sound

Apparatus

Logger, microphone sensor, computer, and tuning forks.

Arrangement

1. Connect the microphone to CH1 of the logger.

2. Connect the logger to the computer.

3. Start the computer logger program.

4. Click on Set Up.

5. In the Set Up menu click on Data Collection.

6. In the pop-up window, click on Real Time Collect.

7. Click on Sampling. Set Experiment Length at 0.03s

Set Sampling Speed at 10000 per sec.

8. Click OK.

Procedure

1. Hold a vibrating tuning fork in front of the microphone.

2. Click on .

3. Observe the pattern on the screen.

4. Click on Analyse.

5. Select Examine.

6. Use the mouse to select a peak and read the time t₁ from the graph.

7. Count on ten peaks and take the time t₂.

The period T of the wave = and frequency.

Notes

Experiment Length may have to be varied depending on the range of frequencies used.

If there is background noise, it may be necessary to use a trigger setting.

Harmonics, which will distort the pattern produced, may occur for low frequency tuning forks (200-320 Hz). Striking the tuning fork more gently to set it vibrating will reduce this distortion.

Ensure that the Data Collection mode is Real Time Collect as it sometimes changes to Repeat.