Question by Rox Tarr: What will be amplitude in mm of a typical sound wave coming from TV speakers ?
What changes occur in amplitude when a sound wave enters a concrete wall and exits it ?
What would be typical and approx. length of movement (in mm) of the molecule of the medium would be ?
I am looking for *amplitude* and not wavelength.

Best answer:

Answer by Ivan A
You probably want to know what is the wavelength of the sound coming out of the TV speakers. The audible range is 20 Hz to 20 kHz, which is the range of frequencies of the sounds that are likely coming out of the speakers, produce a wavelength range of

lambda 1 = 331.3 / 20 = 16m = 16000mm

lambda 2 = 331.3 / 20E3 = 0.016m = 16mm

Edit: your question states “amplitude in mm”. Amplitude of sound waves is NOT measured in mm. In the case of waves traveling in air, the amplitude is measured in units of pressure. Power would be measured in either watts or dBm.

What do you think? Answer below!