The wave phenomenon we will discuss today is beats. This happens when two frequencies are close to each other, but not exactly the same. If it's two sound waves we hear the sound waver between loud (or louder) and soft, then loud again. The "beat" frequency of the oscillation between loud and soft is the difference in frequency between the two main frequencies. The beat frequency is most often much smaller than either main frequency. Orchestras and bands use this phenomena to "tune" their instruments. They tune the instrument so that no beats are heard. Radio uses this to transmit AM radio signals. The beats are the radio announcer's voice or record playing on the radio. The radio receiver "beats" a frequency against the received signal to extract the "sound" coming from the radio. \ If possible (if we have suitable demonstration equipment), we will demonstrate beats. 4. Sketch how beats work, explain, and attach additional pages if necessary. These are only a few wave phenomena - there are many more such as reflection, refraction, interference, and diffraction. We will discuss some or all of these in other assignments. Page left intentionally blank Sound Resonance __________________/__________________/__________________ Names 3 to 5 people per group, – __________________/__________________at 6 split into 2 groups Class:___________________Section: ______________Date:______________ we're going to swirl a sound resonance tube and calculate the sound resonances. How long is the tube in m?
The wave phenomenon we will discuss today is beats. This happens when two frequencies are close to each other, but not exactly the same. If it's two sound waves we hear the sound waver between loud (or louder) and soft, then loud again. The "beat" frequency of the oscillation between loud and soft is the difference in frequency between the two main frequencies. The beat frequency is most often much smaller than either main frequency. Orchestras and bands use this phenomena to "tune" their instruments. They tune the instrument so that no beats are heard. Radio uses this to transmit AM radio signals. The beats are the radio announcer's voice or record playing on the radio. The radio receiver "beats" a frequency against the received signal to extract the "sound" coming from the radio. \ If possible (if we have suitable demonstration equipment), we will demonstrate beats. 4. Sketch how beats work, explain, and attach additional pages if necessary. These are only a few wave phenomena - there are many more such as reflection, refraction, interference, and diffraction. We will discuss some or all of these in other assignments. Page left intentionally blank Sound Resonance __________________/__________________/__________________ Names – 3 to 5 people per group, __________________/__________________at 6 split into 2 groups Class:___________________Section: ______________Date:______________ we're going to swirl a sound resonance tube and calculate the sound resonances. How long is the tube in m?
conceptual_physics_workbook.docx