Physics Classroom: Decibel Scale-Concept Builder
Concept Builders are the newest addition to The Physics Classroom website, designed to target and assess student understanding of a focused concept. This Concept Builder aims to sharpen students' understanding of the logarithmic nature of the Decibel Scale. By comparing the ratio of intensities of Sound B to a Sound A with a given decibel level, learners must determine the decibel level of a Sound Source B. Skills are built through three levels of varying difficulty. The "Help Me" section is especially well-crafted to enable students to independently work through conceptual roadblocks. Immediate feedback is provided for all responses. Mobile-ready, adjustable size file runs well on phones, tablets, laptops, and desktops.
website
PhysClips: Frequency and Pitch
This lively tutorial from the University of New South Wales invites students to interact with multiple representations of pitch, frequency, timbre, and amplitude of sound through animation, film clips, and flow charts. They will explore how pitch depends logarithmically on frequency, the relationship of frequency and musical scales, range of human hearing, and how bats use echolocation. Appropriate for Conceptual Physics, Physics First, and/or Grade 9 Physical Science. Allow about 30 minutes for full exploration and discussion.
website
TeachEngineering: What's a Wavelength
This short activity uses tuning forks, a meter stick, plastic tubes, and graduated cylinders to measure the wavelength of sound. Students with submerge the plastic tubing in water and adjust the length of the tubes to match a particular frequency generated by a tuning fork. Key Takeaways: 1) Students will gain insight into the meaning of wavelength and the relationship between wavelength and frequency. 2) They will understand that it's possible to measure the wavelength of sound using a tube closed at one end. 3) They will gain confidence with the vocabulary of waves: amplitude, crest, frequency, pitch, trough, and wavelength. Very well-suited for middle school classrooms.
website