7.03 Mechanical Wave Worksheet [Place your name here] 1. Sound waves travel through air near room temperature with a speed of 345 m/s. Since we are partial to breathing air and our ears are close to our mouth and nose, most of the sound waves that we hear come to us through the air. Audible sound ranges from 20 Hz to 20,000 Hz. Find the wavelength range of sounds that we can hear. Answer using three significant digits. Speed = wavelength x frequency Therefore, wavelength = speed/frequency i) For, f= 20Hz Wavelength, λ = v/f = 345m/s / 20Hz = 17.25m ii) For, f = 20,000Hz Wavelength, λ = v/f = 345m/s / 20,000Hz = 0.0172m Listen to and see the audible spectrum Photo by Pixaby / Public Domain 2. A person dips the tip of his finger in the water 3.0 times a second. The distance between adjacent crests of the waves produced is 0.12m. What is the speed, period and frequency of waves produced in the water? a) Frequency of the waves = 3Hz (3 pulses every second) PHYSICS by MN Partnership for Collaborative Curriculum is licensed under a Creative Commons AttributionNonCommercial 4.0 International License. b) Period of the waves is 0.12m ( because distance between crests is 0.12m) c) Spe ...
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