Loudness and shrillness are the characteristics that we usually attached to the voice or sound in social life. This is the parameter also to categorize sound. We tried to associate these parameters with the scientific concepts amplitude and frequency.

We did not provide any definition for amplitude and frequency as it is there in the text books.

We focused on the visualization of the amplitude and frequency and its relation with the sound’s loudness and shrillness, using digital tool and by doing  hands-on activity.

Ask them to watch the video which shows the amplitudes of three balls. Displacement from the mean position is shown by an arrow. Discuss the displacement with the students, if required.

Tell them explicitly that amplitude is the maximum displacement from mean position, either up or down. For that we used a tool “Audacity”.
 

You are aware that sound from different sources are different (loud/ shrill). They are different because they are produced in different manner and  even if they have produced in same manner, they have different frequencies and amplitudes.