![]() Loud sounds (above 85 dB for 8 or more hours) can hurt your ears by damaging the sensitive hair cells of the inner ear. Noise is not the only cause of hearing loss, but it is the most common cause in America (and in other industrialized nations). Was the change faster or slower than they thought it might be?Īsk students to give examples of some loud sounds they are exposed to in their environment. Possible responses are in italics.Īsk students if the sound level changed with distance as they had predicted. Note: the results will vary depending on the acoustic characteristics of the room.Īsk students the questions in bold. Procedure may be repeated with the weighting adjustment selected for C-weighting. Collected data can be graphed with distance as the independent variable (x-axis) and sound level as the dependent variable (y-axis).Have the student move back another 10 steps holding the sound level meter and record sound levels in dB.You may need to reduce the decibel range of the sound level meter as it is moved further away from the source of the sound. Without changing the speed of blender or volume on the radio, have the student move away about 4 or 5 steps from the sound source holding the sound level meter and record the sound level in dB.This will be the initial sound level and the zero distance for comparing sound levels change with distance. Adjust the speed of the blender or volume of the radio to get as close to a steady 80 dB reading as possible.Have a student hold the sound level meter (phone or computer microphone) about 4 inches away from the radio or blender.If using a blender, turn it onto the loudest setting If using a radio, turn on the radio and de-tune near a known radio station until there is a constant static sound. ![]() Place blender or radio near the edge of a flat surface facing the classroom. ![]()
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